diff --git a/src/components/MangaViewer.tsx b/src/components/MangaViewer.tsx
index 653c43c..6aded48 100644
--- a/src/components/MangaViewer.tsx
+++ b/src/components/MangaViewer.tsx
@@ -157,26 +157,18 @@ export function MangaViewer({
   useEffect(() => {
     const handler = (e: KeyboardEvent) => {
       if (e.target instanceof HTMLInputElement || e.target instanceof HTMLTextAreaElement) return;
-      switch (e.key) {
-        case 'ArrowRight':
-          e.preventDefault();
-          goNext();
-          break;
-        case 'ArrowLeft':
-          e.preventDefault();
-          goPrev();
-          break;
-        case 'f':
-        case 'F':
-          toggleFullscreen();
-          break;
-        case 's':
-        case 'S':
-          setShowSettings((v) => !v);
-          break;
-        case 'Escape':
-          if (showSettings) setShowSettings(false);
-          break;
+      if (e.code === 'ArrowRight') {
+        e.preventDefault();
+        goNext();
+      } else if (e.code === 'ArrowLeft') {
+        e.preventDefault();
+        goPrev();
+      } else if (e.code === 'KeyF' || e.key === 'f' || e.key === 'F' || e.key === 'ㄹ') {
+        toggleFullscreen();
+      } else if (e.code === 'KeyS' || e.key === 's' || e.key === 'S' || e.key === 'ㄴ') {
+        setShowSettings((v) => !v);
+      } else if (e.key === 'Escape') {
+        if (showSettings) setShowSettings(false);
       }
     };
     window.addEventListener('keydown', handler);