diff --git a/SodaLive/Sources/Extensions/KoreanFontModifier.swift b/SodaLive/Sources/Extensions/KoreanFontModifier.swift
new file mode 100644
index 0000000..c85e7d4
--- /dev/null
+++ b/SodaLive/Sources/Extensions/KoreanFontModifier.swift
@@ -0,0 +1,43 @@
+//
+//  KoreanFontModifier.swift
+//  SodaLive
+//
+//  Created by klaus on 1/23/26.
+//
+
+import SwiftUI
+
+struct KoreanFontModifier: ViewModifier {
+    @Environment(\.locale) private var locale
+    let size: CGFloat
+    let weight: SwiftUI.Font.Weight
+
+    private func resolvedLanguageCode() -> String? {
+        if let raw = UserDefaults.standard.string(forKey: "app.language"),
+           let option = LanguageOption(rawValue: raw),
+           option != .system {
+            return option.rawValue
+        }
+        return locale.language.languageCode?.identifier
+    }
+    
+    func body(content: Content) -> some View {
+        if resolvedLanguageCode() == "ko" {
+            let name: String = switch weight {
+            case .bold: "Pretendard-Bold"
+            case .medium: "Pretendard-Medium"
+            case .light: "Pretendard-Light"
+            default: "Pretendard-Regular"
+            }
+            content.font(.custom(name, size: size))
+        } else {
+            content.font(.system(size: size, weight: weight))
+        }
+    }
+}
+
+extension View {
+    func appFont(size: CGFloat, weight: SwiftUI.Font.Weight = .regular) -> some View {
+        self.modifier(KoreanFontModifier(size: size, weight: weight))
+    }
+}
diff --git a/SodaLive/Sources/Main/Home/TabButton.swift b/SodaLive/Sources/Main/Home/TabButton.swift
index 72f07fa..e989dcd 100644
--- a/SodaLive/Sources/Main/Home/TabButton.swift
+++ b/SodaLive/Sources/Main/Home/TabButton.swift
@@ -12,7 +12,7 @@ struct TabButton: View {
     let title: LocalizedStringResource
     let action: () -> Void
     let image: () -> String
-    let fontName: () -> String
+    let fontWeight: () -> SwiftUI.Font.Weight
     let color: () -> Color
     let width: CGFloat
     
@@ -21,7 +21,7 @@ struct TabButton: View {
             Image(image())
             
             Text(title)
-                .font(.custom(fontName(), size: 10))
+                .appFont(size: 10, weight: fontWeight())
                 .foregroundColor(color())
         }
         .frame(width: width)
@@ -37,7 +37,7 @@ struct TabButton_Previews: PreviewProvider {
             title: "라이브",
             action: {},
             image: { "ic_tabbar_live_selected" },
-            fontName: { Font.bold.rawValue },
+            fontWeight: { .bold },
             color: { Color(hex: "3bb9f1") },
             width: UIScreen.main.bounds.width / 4
         )