diff --git a/Source/UI/CandidateUI/HorizontalCandidateController.swift b/Source/UI/CandidateUI/HorizontalCandidateController.swift
index a8faeb52..bab60327 100644
--- a/Source/UI/CandidateUI/HorizontalCandidateController.swift
+++ b/Source/UI/CandidateUI/HorizontalCandidateController.swift
@@ -132,6 +132,14 @@ fileprivate class HorizontalCandidateView: NSView {
             } else {
                 NSColor.controlBackgroundColor.setFill()
             }
+            switch ctlInputMethod.currentKeyHandler.inputMode {
+            case InputMode.imeModeCHS:
+                if #available(macOS 12.0, *) {activeCandidateAttr[.languageIdentifier] = "zh-Hans" as AnyObject}
+            case InputMode.imeModeCHT:
+                if #available(macOS 12.0, *) {activeCandidateAttr[.languageIdentifier] = "zh-Hant" as AnyObject}
+            default:
+                break
+            }
             NSBezierPath.fill(rctCandidateArea)
             (keyLabels[index] as NSString).draw(in: rctLabel, withAttributes: activeCandidateIndexAttr)
             (displayedCandidates[index] as NSString).draw(in: rctCandidatePhrase, withAttributes: activeCandidateAttr)
diff --git a/Source/UI/CandidateUI/VerticalCandidateController.swift b/Source/UI/CandidateUI/VerticalCandidateController.swift
index 64b67eae..da384088 100644
--- a/Source/UI/CandidateUI/VerticalCandidateController.swift
+++ b/Source/UI/CandidateUI/VerticalCandidateController.swift
@@ -138,6 +138,14 @@ fileprivate class VerticalCandidateView: NSView {
             } else {
                 NSColor.controlBackgroundColor.setFill()
             }
+            switch ctlInputMethod.currentKeyHandler.inputMode {
+            case InputMode.imeModeCHS:
+                if #available(macOS 12.0, *) {activeCandidateAttr[.languageIdentifier] = "zh-Hans" as AnyObject}
+            case InputMode.imeModeCHT:
+                if #available(macOS 12.0, *) {activeCandidateAttr[.languageIdentifier] = "zh-Hant" as AnyObject}
+            default:
+                break
+            }
             NSBezierPath.fill(rctCandidateArea)
             (keyLabels[index] as NSString).draw(in: rctLabel, withAttributes: activeCandidateIndexAttr)
             (displayedCandidates[index] as NSString).draw(in: rctCandidatePhrase, withAttributes: activeCandidateAttr)