diff --git a/osu.Game.Rulesets.Karaoke.Tests/Edit/TestSceneImportLyric.cs b/osu.Game.Rulesets.Karaoke.Tests/Edit/TestSceneImportLyric.cs
index 11deda5f6..7a1e81634 100644
--- a/osu.Game.Rulesets.Karaoke.Tests/Edit/TestSceneImportLyric.cs
+++ b/osu.Game.Rulesets.Karaoke.Tests/Edit/TestSceneImportLyric.cs
@@ -58,7 +58,7 @@ private void load()
         [Test]
         public void TestGoToStep() => Schedule(() =>
         {
-            var temp = TestResources.GetTestLrcForImport("default");
+            var temp = TestResources.GetTestLrcForImport("light");
             Child = screen = new TestImportLyricScreen(new FileInfo(temp));
 
             var steps = (ImportLyricStep[])Enum.GetValues(typeof(ImportLyricStep));
diff --git a/osu.Game.Rulesets.Karaoke.Tests/Edit/TestSceneManageLanguagesDialog.cs b/osu.Game.Rulesets.Karaoke.Tests/Edit/TestSceneManageLanguagesDialog.cs
index 952fa69cc..f8579ab34 100644
--- a/osu.Game.Rulesets.Karaoke.Tests/Edit/TestSceneManageLanguagesDialog.cs
+++ b/osu.Game.Rulesets.Karaoke.Tests/Edit/TestSceneManageLanguagesDialog.cs
@@ -21,7 +21,7 @@ public class TestSceneManageLanguagesDialog : OsuManualInputManagerTestScene
         protected override Container<Drawable> Content { get; } = new Container { RelativeSizeAxes = Axes.Both };
 
         private DialogOverlay dialogOverlay;
-        private LanguageManager manager;
+        private TranslateManager manager;
 
         private ManageLanguagesDialog dialog;
 
@@ -35,7 +35,7 @@ private void load()
 
             base.Content.AddRange(new Drawable[]
             {
-                manager = new LanguageManager(),
+                manager = new TranslateManager(),
                 Content,
                 dialogOverlay = new DialogOverlay()
             });
diff --git a/osu.Game.Rulesets.Karaoke.Tests/Resources/Testing/Lrc/light.lrc b/osu.Game.Rulesets.Karaoke.Tests/Resources/Testing/Lrc/light.lrc
new file mode 100644
index 000000000..41d51fe78
--- /dev/null
+++ b/osu.Game.Rulesets.Karaoke.Tests/Resources/Testing/Lrc/light.lrc
@@ -0,0 +1,34 @@
+枯れた世界に輝く　名もない永遠の華
+強く生きていけるよう　私を変えていく
+
+あぁ、わかっていたの　本当は
+光なんて求めちゃいけないってこと
+
+あぁ、それでもきっと人は
+輝く未来なんてものを求めてさまよう
+
+女神なんて　信じてるわけじゃない
+未来をこの　手で切り開く勇気が　強さがほしい
+あなたを守りたい
+
+枯れた世界に輝く　名もない永遠の華
+強く生きていけるよう　私を変えていく
+
+あぁ、例えこの世が暗く
+絶望に飲み込まれても　私は大丈夫
+
+あなたがいればそこは
+灰色(いろ)(いろ)の景色(いろ)(いろ)さえ色づき始める
+
+華もきっと　咲き誇るときを終え
+いつかきっと　また蕾をつけるだろう　
+終わることない
+生命（いのち）が続くまでは
+
+あなたの手を離さない　瞳に誓う　永遠の恋
+強く儚い思いを　守り続けていたい
+
+枯れた世界に輝く　名もない永遠の華
+強く生き抜きけるように　私を変えていく
+あなたの手を離さない　瞳に誓う　永遠の恋
+強く儚い思いを　守り続けていたい
\ No newline at end of file
diff --git a/osu.Game.Rulesets.Karaoke/Beatmaps/Formats/LrcEncoder.cs b/osu.Game.Rulesets.Karaoke/Beatmaps/Formats/LrcEncoder.cs
index 9ee473c2d..44d7b65e1 100644
--- a/osu.Game.Rulesets.Karaoke/Beatmaps/Formats/LrcEncoder.cs
+++ b/osu.Game.Rulesets.Karaoke/Beatmaps/Formats/LrcEncoder.cs
@@ -35,9 +35,6 @@ private LyricLine encodeLyric(Objects.Lyric lyric) =>
 
         private IEnumerable<TimeTag> convertTimeTag(string text, IReadOnlyDictionary<TimeTagIndex, double> tags)
         {
-            if (tags == null || !tags.Any())
-                throw new ArgumentNullException($"{nameof(tags)} cannot be null.");
-
             var totalTags = text.Length * 2 + 2;
 
             for (int i = 0; i < totalTags; i++)
diff --git a/osu.Game.Rulesets.Karaoke/Edit/Generator/TimeTags/Ja/JaTimeTagGenerator.cs b/osu.Game.Rulesets.Karaoke/Edit/Generator/TimeTags/Ja/JaTimeTagGenerator.cs
index c9735aa78..9d2e8dab0 100644
--- a/osu.Game.Rulesets.Karaoke/Edit/Generator/TimeTags/Ja/JaTimeTagGenerator.cs
+++ b/osu.Game.Rulesets.Karaoke/Edit/Generator/TimeTags/Ja/JaTimeTagGenerator.cs
@@ -139,6 +139,7 @@ protected override void TimeTagLogic(Lyric lyric, List<Tuple<TimeTagIndex, doubl
                     }
                 }
             }
+
             return timeTags;
         }
     }
diff --git a/osu.Game.Rulesets.Karaoke/Edit/Generator/TimeTags/Zh/ZhTimeTagGenerator.cs b/osu.Game.Rulesets.Karaoke/Edit/Generator/TimeTags/Zh/ZhTimeTagGenerator.cs
index 44fbfea62..806950a86 100644
--- a/osu.Game.Rulesets.Karaoke/Edit/Generator/TimeTags/Zh/ZhTimeTagGenerator.cs
+++ b/osu.Game.Rulesets.Karaoke/Edit/Generator/TimeTags/Zh/ZhTimeTagGenerator.cs
@@ -19,6 +19,7 @@ public ZhTimeTagGenerator(ZhTimeTagGeneratorConfig config)
         protected override void TimeTagLogic(Lyric lyric, List<Tuple<TimeTagIndex, double?>> timeTags)
         {
             var text = lyric.Text;
+
             for (var i = 1; i < text.Length; i++)
             {
                 if (CharUtils.IsChinese(text[i]))
diff --git a/osu.Game.Rulesets.Karaoke/Edit/ImportLyric/AssignLanguage/AssignLanguageSubScreen.cs b/osu.Game.Rulesets.Karaoke/Edit/ImportLyric/AssignLanguage/AssignLanguageSubScreen.cs
index e552ae248..8b5ce3522 100644
--- a/osu.Game.Rulesets.Karaoke/Edit/ImportLyric/AssignLanguage/AssignLanguageSubScreen.cs
+++ b/osu.Game.Rulesets.Karaoke/Edit/ImportLyric/AssignLanguage/AssignLanguageSubScreen.cs
@@ -19,6 +19,14 @@ public class AssignLanguageSubScreen : ImportLyricSubScreenWithTopNavigation
 
         public override IconUsage Icon => FontAwesome.Solid.Globe;
 
+        [Cached]
+        protected readonly LyricManager LyricManager;
+
+        public AssignLanguageSubScreen()
+        {
+            AddInternal(LyricManager = new LyricManager());
+        }
+
         protected override IReadOnlyDependencyContainer CreateChildDependencies(IReadOnlyDependencyContainer parent)
         {
             var dependencies = new DependencyContainer(base.CreateChildDependencies(parent));
@@ -56,7 +64,8 @@ protected void AskForAutoAssignLanguage()
         {
             DialogOverlay.Push(new UseLanguageDetectorPopupDialog(ok =>
             {
-                // todo : call manager to do that.
+                if (ok)
+                    LyricManager.AutoDetectLyricLanguage();
             }));
         }
 
diff --git a/osu.Game.Rulesets.Karaoke/Edit/ImportLyric/GenerateRuby/GenerateRubySubScreen.cs b/osu.Game.Rulesets.Karaoke/Edit/ImportLyric/GenerateRuby/GenerateRubySubScreen.cs
index f0a84d24c..c7247f401 100644
--- a/osu.Game.Rulesets.Karaoke/Edit/ImportLyric/GenerateRuby/GenerateRubySubScreen.cs
+++ b/osu.Game.Rulesets.Karaoke/Edit/ImportLyric/GenerateRuby/GenerateRubySubScreen.cs
@@ -1,6 +1,7 @@
 // Copyright (c) andy840119 <andy840119@gmail.com>. Licensed under the GPL Licence.
 // See the LICENCE file in the repository root for full licence text.
 
+using osu.Framework.Allocation;
 using osu.Framework.Graphics;
 using osu.Framework.Graphics.Sprites;
 using osu.Game.Rulesets.Karaoke.Edit.RubyRomaji;
@@ -17,6 +18,14 @@ public class GenerateRubySubScreen : ImportLyricSubScreenWithTopNavigation
 
         public override IconUsage Icon => FontAwesome.Solid.Gem;
 
+        [Cached]
+        protected readonly RubyRomajiManager RubyRomajiManager;
+
+        public GenerateRubySubScreen()
+        {
+            AddInternal(RubyRomajiManager = new RubyRomajiManager());
+        }
+
         protected override TopNavigation CreateNavigation()
             => new GenerateRubyNavigation(this);
 
@@ -42,7 +51,8 @@ protected void AskForAutoGenerateRuby()
         {
             DialogOverlay.Push(new UseAutoGenerateRubyPopupDialog(ok =>
             {
-                // todo : call manager to do that.
+                if (ok)
+                    RubyRomajiManager.AutoGenerateRubyTags();
             }));
         }
 
diff --git a/osu.Game.Rulesets.Karaoke/Edit/ImportLyric/GenerateTimeTag/GenerateTimeTagSubScreen.cs b/osu.Game.Rulesets.Karaoke/Edit/ImportLyric/GenerateTimeTag/GenerateTimeTagSubScreen.cs
index 591fe470d..fdadbabec 100644
--- a/osu.Game.Rulesets.Karaoke/Edit/ImportLyric/GenerateTimeTag/GenerateTimeTagSubScreen.cs
+++ b/osu.Game.Rulesets.Karaoke/Edit/ImportLyric/GenerateTimeTag/GenerateTimeTagSubScreen.cs
@@ -19,6 +19,14 @@ public class GenerateTimeTagSubScreen : ImportLyricSubScreenWithTopNavigation
 
         public override IconUsage Icon => FontAwesome.Solid.Tag;
 
+        [Cached]
+        protected readonly TimeTagManager TimeTagManager;
+
+        public GenerateTimeTagSubScreen()
+        {
+            AddInternal(TimeTagManager = new TimeTagManager());
+        }
+
         protected override IReadOnlyDependencyContainer CreateChildDependencies(IReadOnlyDependencyContainer parent)
         {
             var dependencies = new DependencyContainer(base.CreateChildDependencies(parent));
@@ -56,7 +64,8 @@ protected void AskForAutoGenerateTimeTag()
         {
             DialogOverlay.Push(new UseAutoGenerateTimeTagPopupDialog(ok =>
             {
-                // todo : call manager to do that.
+                if (ok)
+                    TimeTagManager.AutoGenerateTimeTags();
             }));
         }
 
diff --git a/osu.Game.Rulesets.Karaoke/Edit/ImportLyric/ImportLyricManager.cs b/osu.Game.Rulesets.Karaoke/Edit/ImportLyric/ImportLyricManager.cs
index ac1c90a27..943d7101c 100644
--- a/osu.Game.Rulesets.Karaoke/Edit/ImportLyric/ImportLyricManager.cs
+++ b/osu.Game.Rulesets.Karaoke/Edit/ImportLyric/ImportLyricManager.cs
@@ -8,6 +8,7 @@
 using osu.Framework.Graphics;
 using osu.Game.Beatmaps;
 using osu.Game.Rulesets.Karaoke.Beatmaps.Formats;
+using osu.Game.Rulesets.Karaoke.Objects;
 using osu.Game.Screens.Edit;
 
 namespace osu.Game.Rulesets.Karaoke.Edit.ImportLyric
@@ -52,10 +53,12 @@ public void ImportLrcFile(FileInfo info)
                     var decoder = new LrcDecoder();
                     var lrcBeatmap = decoder.Decode(reader);
 
-                    // todo : remove all notes and lyric
-                    // or just clear all beatmap because not really sure is singer should be removed also?
+                    // remove all hit objects (note and lyric) from beatmap
+                    editorBeatmap.Clear();
 
                     // then re-add the lyric.
+                    var lyrics = lrcBeatmap.HitObjects.OfType<Lyric>();
+                    editorBeatmap.AddRange(lyrics);
                 }
             }
         }
diff --git a/osu.Game.Rulesets.Karaoke/Edit/Lyrics/Components/Badges/LanguageInfoBadge.cs b/osu.Game.Rulesets.Karaoke/Edit/Lyrics/Components/Badges/LanguageInfoBadge.cs
index 1cbb890ac..ef98df15c 100644
--- a/osu.Game.Rulesets.Karaoke/Edit/Lyrics/Components/Badges/LanguageInfoBadge.cs
+++ b/osu.Game.Rulesets.Karaoke/Edit/Lyrics/Components/Badges/LanguageInfoBadge.cs
@@ -16,10 +16,7 @@ public LanguageInfoBadge(Lyric lyric)
             {
                 var language = value.NewValue;
 
-                if (language == null)
-                    BadgeText = "None";
-                else
-                    BadgeText = language.DisplayName;
+                BadgeText = language == null ? "None" : language.DisplayName;
             }, true);
         }
 
diff --git a/osu.Game.Rulesets.Karaoke/Edit/Lyrics/Components/LyricControl.cs b/osu.Game.Rulesets.Karaoke/Edit/Lyrics/Components/LyricControl.cs
index f18c5a540..81bdc5034 100644
--- a/osu.Game.Rulesets.Karaoke/Edit/Lyrics/Components/LyricControl.cs
+++ b/osu.Game.Rulesets.Karaoke/Edit/Lyrics/Components/LyricControl.cs
@@ -72,7 +72,7 @@ protected override void ApplyFont(KaraokeFont font)
                     return;
 
                 // todo : need to delay until karaoke text has been calculated.
-                ScheduleAfterChildren(() => UpdateTimeTags());
+                ScheduleAfterChildren(UpdateTimeTags);
             }
 
             protected override void ApplyLayout(KaraokeLayout layout)
@@ -101,7 +101,11 @@ public override double LifetimeEnd
             protected void UpdateTimeTags()
             {
                 timeTagContainer.Clear();
-                foreach (var timeTag in TimeTagsBindable.Value)
+                var timeTags = TimeTagsBindable.Value;
+                if (timeTags == null)
+                    return;
+
+                foreach (var timeTag in timeTags)
                 {
                     var index = Math.Min(timeTag.Item1.Index, HitObject.Text.Length - 1);
                     var percentage = timeTag.Item1.State == TimeTagIndex.IndexState.Start ? 0 : 1;
diff --git a/osu.Game.Rulesets.Karaoke/Edit/Lyrics/DrawableLyricEditListItem.cs b/osu.Game.Rulesets.Karaoke/Edit/Lyrics/DrawableLyricEditListItem.cs
index 055f88b12..a02a0c3a6 100644
--- a/osu.Game.Rulesets.Karaoke/Edit/Lyrics/DrawableLyricEditListItem.cs
+++ b/osu.Game.Rulesets.Karaoke/Edit/Lyrics/DrawableLyricEditListItem.cs
@@ -108,7 +108,7 @@ protected override Drawable CreateContent()
                                                 // in larger size should use real icon.
                                                 new LanguageInfoBadge(Model)
                                                 {
-                                                    Margin = new MarginPadding{ Right = 5 }
+                                                    Margin = new MarginPadding { Right = 5 }
                                                 }
                                             }
                                         },
diff --git a/osu.Game.Rulesets.Karaoke/Edit/Lyrics/LyricManager.cs b/osu.Game.Rulesets.Karaoke/Edit/Lyrics/LyricManager.cs
new file mode 100644
index 000000000..4645a6d97
--- /dev/null
+++ b/osu.Game.Rulesets.Karaoke/Edit/Lyrics/LyricManager.cs
@@ -0,0 +1,45 @@
+// Copyright (c) andy840119 <andy840119@gmail.com>. Licensed under the GPL Licence.
+// See the LICENCE file in the repository root for full licence text.
+
+using osu.Framework.Allocation;
+using osu.Framework.Graphics;
+using osu.Game.Rulesets.Karaoke.Edit.Generator.Languages;
+using osu.Game.Rulesets.Karaoke.Objects;
+using osu.Game.Screens.Edit;
+using System.Linq;
+
+namespace osu.Game.Rulesets.Karaoke.Edit.Lyrics
+{
+    public class LyricManager : Component
+    {
+        [Resolved]
+        private EditorBeatmap beatmap { get; set; }
+
+        [Resolved(CanBeNull = true)]
+        private IEditorChangeHandler changeHandler { get; set; }
+
+        /// <summary>
+        /// Will auto-detect each <see cref="Lyric"/> 's <see cref="Lyric.Language"/> and apply on them.
+        /// </summary>
+        public void AutoDetectLyricLanguage()
+        {
+            var lyrics = beatmap.HitObjects.OfType<Lyric>().ToList();
+            if (!lyrics.Any())
+                return;
+
+            // todo : should get the config from setting.
+            var config = new LanguageDetectorConfig();
+            var detector = new LanguageDetector(config);
+
+            changeHandler?.BeginChange();
+
+            foreach (var lyric in lyrics)
+            {
+                var detectedLanguage = detector.DetectLanguage(lyric);
+                lyric.Language = detectedLanguage;
+            }
+
+            changeHandler?.EndChange();
+        }
+    }
+}
diff --git a/osu.Game.Rulesets.Karaoke/Edit/Lyrics/TimeTagManager.cs b/osu.Game.Rulesets.Karaoke/Edit/Lyrics/TimeTagManager.cs
new file mode 100644
index 000000000..5a016325c
--- /dev/null
+++ b/osu.Game.Rulesets.Karaoke/Edit/Lyrics/TimeTagManager.cs
@@ -0,0 +1,85 @@
+// Copyright (c) andy840119 <andy840119@gmail.com>. Licensed under the GPL Licence.
+// See the LICENCE file in the repository root for full licence text.
+
+using osu.Framework.Allocation;
+using osu.Framework.Graphics;
+using osu.Framework.Graphics.Sprites;
+using osu.Game.Rulesets.Karaoke.Edit.Generator.TimeTags.Ja;
+using osu.Game.Rulesets.Karaoke.Edit.Generator.TimeTags.Zh;
+using osu.Game.Rulesets.Karaoke.Objects;
+using osu.Game.Screens.Edit;
+using System;
+using System.Linq;
+
+namespace osu.Game.Rulesets.Karaoke.Edit.Lyrics
+{
+    public class TimeTagManager : Component
+    {
+        [Resolved]
+        private EditorBeatmap beatmap { get; set; }
+
+        [Resolved(CanBeNull = true)]
+        private IEditorChangeHandler changeHandler { get; set; }
+
+        /// <summary>
+        /// Will auto-detect each <see cref="Lyric"/> 's <see cref="Lyric.TimeTags"/> and apply on them.
+        /// </summary>
+        public void AutoGenerateTimeTags()
+        {
+            var lyrics = beatmap.HitObjects.OfType<Lyric>().ToList();
+            if (!lyrics.Any())
+                return;
+
+            changeHandler?.BeginChange();
+
+            var selector = new TimeTagGeneratorSelector();
+
+            foreach (var lyric in lyrics)
+            {
+                var timeTags = selector.GenerateTimeTags(lyric);
+                lyric.TimeTags = timeTags;
+            }
+
+            changeHandler?.EndChange();
+        }
+
+        public class TimeTagGeneratorSelector
+        {
+            private readonly Lazy<JaTimeTagGenerator> jaTimeTagGenerator;
+            private readonly Lazy<ZhTimeTagGenerator> zhTimeTagGenerator;
+
+            public TimeTagGeneratorSelector()
+            {
+                jaTimeTagGenerator = new Lazy<JaTimeTagGenerator>(() =>
+                {
+                    // todo : get config from setting.
+                    var config = new JaTimeTagGeneratorConfig();
+                    return new JaTimeTagGenerator(config);
+                });
+                zhTimeTagGenerator = new Lazy<ZhTimeTagGenerator>(() =>
+                {
+                    // todo : get config from setting.
+                    var config = new ZhTimeTagGeneratorConfig();
+                    return new ZhTimeTagGenerator(config);
+                });
+            }
+
+            public Tuple<TimeTagIndex, double?>[] GenerateTimeTags(Lyric lyric)
+            {
+                // lazy to generate language detector and apply it's setting
+                switch (lyric.Language.LCID)
+                {
+                    case 17:
+                    case 1041:
+                        return jaTimeTagGenerator.Value.CreateTimeTags(lyric);
+
+                    case 1028:
+                        return zhTimeTagGenerator.Value.CreateTimeTags(lyric);
+
+                    default:
+                        return null;
+                }
+            }
+        }
+    }
+}
diff --git a/osu.Game.Rulesets.Karaoke/Edit/RubyRomaji/RubyRomajiManager.cs b/osu.Game.Rulesets.Karaoke/Edit/RubyRomaji/RubyRomajiManager.cs
new file mode 100644
index 000000000..fd83ca9dc
--- /dev/null
+++ b/osu.Game.Rulesets.Karaoke/Edit/RubyRomaji/RubyRomajiManager.cs
@@ -0,0 +1,73 @@
+// Copyright (c) andy840119 <andy840119@gmail.com>. Licensed under the GPL Licence.
+// See the LICENCE file in the repository root for full licence text.
+
+using osu.Framework.Allocation;
+using osu.Framework.Graphics;
+using osu.Game.Rulesets.Karaoke.Edit.Generator.RubyTags.Ja;
+using osu.Game.Rulesets.Karaoke.Objects;
+using osu.Game.Screens.Edit;
+using System;
+using System.Linq;
+
+namespace osu.Game.Rulesets.Karaoke.Edit.RubyRomaji
+{
+    public class RubyRomajiManager : Component
+    {
+        [Resolved]
+        private EditorBeatmap beatmap { get; set; }
+
+        [Resolved(CanBeNull = true)]
+        private IEditorChangeHandler changeHandler { get; set; }
+
+        /// <summary>
+        /// Will auto-detect each <see cref="Lyric"/> 's <see cref="Lyric.RubyTags"/> and apply on them.
+        /// </summary>
+        public void AutoGenerateRubyTags()
+        {
+            var lyrics = beatmap.HitObjects.OfType<Lyric>().ToList();
+            if (!lyrics.Any())
+                return;
+
+            changeHandler?.BeginChange();
+
+            var selector = new RubyTagGeneratorSelector();
+
+            foreach (var lyric in lyrics)
+            {
+                var rubyTags = selector.GenerateRubyTags(lyric);
+                lyric.RubyTags = rubyTags;
+            }
+
+            changeHandler?.EndChange();
+        }
+
+        public class RubyTagGeneratorSelector
+        {
+            private readonly Lazy<JaRubyTagGenerator> jaRubyTagGenerator;
+
+            public RubyTagGeneratorSelector()
+            {
+                jaRubyTagGenerator = new Lazy<JaRubyTagGenerator>(() =>
+                {
+                    // todo : get config from setting.
+                    var config = new JaRubyTagGeneratorConfig();
+                    return new JaRubyTagGenerator(config);
+                });
+            }
+
+            public RubyTag[] GenerateRubyTags(Lyric lyric)
+            {
+                // lazy to generate language detector and apply it's setting
+                switch (lyric.Language.LCID)
+                {
+                    case 17:
+                    case 1041:
+                        return jaRubyTagGenerator.Value.CreateRubyTags(lyric);
+
+                    default:
+                        return null;
+                }
+            }
+        }
+    }
+}
diff --git a/osu.Game.Rulesets.Karaoke/Edit/Style/NoteStylePreview.cs b/osu.Game.Rulesets.Karaoke/Edit/Style/NoteStylePreview.cs
index c939e63bb..3b3733142 100644
--- a/osu.Game.Rulesets.Karaoke/Edit/Style/NoteStylePreview.cs
+++ b/osu.Game.Rulesets.Karaoke/Edit/Style/NoteStylePreview.cs
@@ -71,7 +71,7 @@ public class PreviewScrollingInfo : IScrollingInfo
 
             public IBindable<double> TimeRange { get; } = new BindableDouble();
 
-            public IScrollAlgorithm Algorithm { get; set; } = new ZeroScrollAlgorithm();
+            public IScrollAlgorithm Algorithm { get; } = new ZeroScrollAlgorithm();
 
             private class ZeroScrollAlgorithm : IScrollAlgorithm
             {
diff --git a/osu.Game.Rulesets.Karaoke/Edit/Translate/Components/DrawableLanguageListItem.cs b/osu.Game.Rulesets.Karaoke/Edit/Translate/Components/DrawableLanguageListItem.cs
index 96804dd4b..29160b459 100644
--- a/osu.Game.Rulesets.Karaoke/Edit/Translate/Components/DrawableLanguageListItem.cs
+++ b/osu.Game.Rulesets.Karaoke/Edit/Translate/Components/DrawableLanguageListItem.cs
@@ -26,7 +26,7 @@ public class DrawableLanguageListItem : OsuRearrangeableListItem<BeatmapSetOnlin
         private const float button_width = item_height * 0.75f;
 
         /// <summary>
-        /// Whether the <see cref="BeatmapSetOnlineLanguage"/> currently exists inside the <see cref="LanguageManager"/>.
+        /// Whether the <see cref="BeatmapSetOnlineLanguage"/> currently exists inside the <see cref="TranslateManager"/>.
         /// </summary>
         public IBindable<bool> IsCreated => isCreated;
 
@@ -36,7 +36,7 @@ public class DrawableLanguageListItem : OsuRearrangeableListItem<BeatmapSetOnlin
         /// Creates a new <see cref="DrawableLanguageListItem"/>.
         /// </summary>
         /// <param name="item">The <see cref="BeatmapSetOnlineLanguage"/>.</param>
-        /// <param name="isCreated">Whether <paramref name="item"/> currently exists inside the <see cref="LanguageManager"/>.</param>
+        /// <param name="isCreated">Whether <paramref name="item"/> currently exists inside the <see cref="TranslateManager"/>.</param>
         public DrawableLanguageListItem(BeatmapSetOnlineLanguage item, bool isCreated)
             : base(item)
         {
@@ -60,7 +60,7 @@ private class ItemContent : CircularContainer
             private readonly BeatmapSetOnlineLanguage language;
 
             [Resolved(CanBeNull = true)]
-            private LanguageManager languageManager { get; set; }
+            private TranslateManager languageManager { get; set; }
 
             private Container textBoxPaddingContainer;
             private ItemTextBox textBox;
@@ -160,7 +160,7 @@ public class DeleteButton : CompositeDrawable
                 private DialogOverlay dialogOverlay { get; set; }
 
                 [Resolved(CanBeNull = true)]
-                private LanguageManager languageManager { get; set; }
+                private TranslateManager translateManager { get; set; }
 
                 private readonly BeatmapSetOnlineLanguage language;
 
@@ -224,7 +224,7 @@ protected override bool OnClick(ClickEvent e)
                 {
                     background.FlashColour(Color4.White, 150);
 
-                    if (!languageManager?.IsLanguageContainsTranslate(language) ?? false)
+                    if (!translateManager?.IsLanguageContainsTranslate(language) ?? false)
                         deleteLanguage();
                     else
                         dialogOverlay?.Push(new DeleteLanguageDialog(language, deleteLanguage));
@@ -232,7 +232,7 @@ protected override bool OnClick(ClickEvent e)
                     return true;
                 }
 
-                private void deleteLanguage() => languageManager?.RemoveLanguage(language);
+                private void deleteLanguage() => translateManager?.RemoveLanguage(language);
             }
         }
     }
diff --git a/osu.Game.Rulesets.Karaoke/Edit/Translate/Components/ManageLanguagesDialog.cs b/osu.Game.Rulesets.Karaoke/Edit/Translate/Components/ManageLanguagesDialog.cs
index 8b04d6453..30c06880a 100644
--- a/osu.Game.Rulesets.Karaoke/Edit/Translate/Components/ManageLanguagesDialog.cs
+++ b/osu.Game.Rulesets.Karaoke/Edit/Translate/Components/ManageLanguagesDialog.cs
@@ -21,14 +21,14 @@ public ManageLanguagesDialog()
         }
 
         [BackgroundDependencyLoader]
-        private void load(LanguageManager languageManager)
+        private void load(TranslateManager translateManager)
         {
             Children = new Drawable[]
             {
                 new DrawableLanguageList
                 {
                     RelativeSizeAxes = Axes.Both,
-                    Items = { BindTarget = languageManager?.Languages ?? new BindableList<BeatmapSetOnlineLanguage>() }
+                    Items = { BindTarget = translateManager?.Languages ?? new BindableList<BeatmapSetOnlineLanguage>() }
                 }
             };
         }
diff --git a/osu.Game.Rulesets.Karaoke/Edit/Translate/TranslateEditSection.cs b/osu.Game.Rulesets.Karaoke/Edit/Translate/TranslateEditSection.cs
index 6be984596..af34356c5 100644
--- a/osu.Game.Rulesets.Karaoke/Edit/Translate/TranslateEditSection.cs
+++ b/osu.Game.Rulesets.Karaoke/Edit/Translate/TranslateEditSection.cs
@@ -1,7 +1,6 @@
 // Copyright (c) andy840119 <andy840119@gmail.com>. Licensed under the GPL Licence.
 // See the LICENCE file in the repository root for full licence text.
 
-using System;
 using System.Collections.Generic;
 using System.Linq;
 using osu.Framework.Allocation;
@@ -141,9 +140,9 @@ Dimension[] createRowDimension() => editorBeatmap.HitObjects.OfType<Lyric>()
         }
 
         [BackgroundDependencyLoader]
-        private void load(LanguageManager languageManager, OsuColour colours)
+        private void load(TranslateManager translateManager, OsuColour colours)
         {
-            languageDropdown.ItemSource = languageManager?.Languages ?? new BindableList<BeatmapSetOnlineLanguage>();
+            languageDropdown.ItemSource = translateManager?.Languages ?? new BindableList<BeatmapSetOnlineLanguage>();
 
             timeSectionBackground.Colour = colours.ContextMenuGray;
             lyricSectionBackground.Colour = colours.Gray9;
diff --git a/osu.Game.Rulesets.Karaoke/Edit/Translate/LanguageManager.cs b/osu.Game.Rulesets.Karaoke/Edit/Translate/TranslateManager.cs
similarity index 97%
rename from osu.Game.Rulesets.Karaoke/Edit/Translate/LanguageManager.cs
rename to osu.Game.Rulesets.Karaoke/Edit/Translate/TranslateManager.cs
index 5e9dd68c7..71a6ffda1 100644
--- a/osu.Game.Rulesets.Karaoke/Edit/Translate/LanguageManager.cs
+++ b/osu.Game.Rulesets.Karaoke/Edit/Translate/TranslateManager.cs
@@ -15,7 +15,7 @@ namespace osu.Game.Rulesets.Karaoke.Edit.Translate
     /// <summary>
     /// Handle create or delete language.
     /// </summary>
-    public class LanguageManager : Component
+    public class TranslateManager : Component
     {
         public readonly BindableList<BeatmapSetOnlineLanguage> Languages = new BindableList<BeatmapSetOnlineLanguage>();
 
diff --git a/osu.Game.Rulesets.Karaoke/Edit/Translate/TranslateScreen.cs b/osu.Game.Rulesets.Karaoke/Edit/Translate/TranslateScreen.cs
index bfe5761ad..5b1866f41 100644
--- a/osu.Game.Rulesets.Karaoke/Edit/Translate/TranslateScreen.cs
+++ b/osu.Game.Rulesets.Karaoke/Edit/Translate/TranslateScreen.cs
@@ -18,13 +18,13 @@ public class TranslateScreen : EditorScreen
         protected readonly OverlayColourProvider ColourProvider;
 
         [Cached]
-        protected readonly LanguageManager LanguageManager;
+        protected readonly TranslateManager TranslateManager;
 
         public TranslateScreen()
             : base(EditorScreenMode.SongSetup)
         {
             ColourProvider = new OverlayColourProvider(OverlayColourScheme.Green);
-            Content.Add(LanguageManager = new LanguageManager());
+            Content.Add(TranslateManager = new TranslateManager());
         }
 
         [BackgroundDependencyLoader]
diff --git a/osu.Game.Rulesets.Karaoke/Utils/TimeTagsUtils.cs b/osu.Game.Rulesets.Karaoke/Utils/TimeTagsUtils.cs
index e398db2c0..e045ecc35 100644
--- a/osu.Game.Rulesets.Karaoke/Utils/TimeTagsUtils.cs
+++ b/osu.Game.Rulesets.Karaoke/Utils/TimeTagsUtils.cs
@@ -112,6 +112,9 @@ public static class TimeTagsUtils
         /// <returns>Fixed time tags.</returns>
         public static Tuple<TimeTagIndex, double?>[] FixInvalid(Tuple<TimeTagIndex, double?>[] timeTags, GroupCheck other = GroupCheck.Asc, SelfCheck self = SelfCheck.BasedOnStart)
         {
+            if (timeTags == null || timeTags.Length == 0)
+                return timeTags;
+
             var sortedTimeTags = Sort(timeTags);
             var groupedTimeTags = sortedTimeTags.GroupBy(x => x.Item1.Index);
 
@@ -184,6 +187,9 @@ public static class TimeTagsUtils
         public static IReadOnlyDictionary<TimeTagIndex, double> ToDictionary(Tuple<TimeTagIndex, double?>[] timeTags, bool applyFix = true, GroupCheck other = GroupCheck.Asc,
                                                                              SelfCheck self = SelfCheck.BasedOnStart)
         {
+            if (timeTags == null)
+                return new Dictionary<TimeTagIndex, double>();
+
             // sorted value
             var sortedTimeTags = applyFix ? FixInvalid(timeTags, other, self) : Sort(timeTags);