diff --git a/to-lower-case/JeonBeomGu-S.java b/to-lower-case/JeonBeomGu-S.java
new file mode 100644
index 0000000000..99d68c63d9
--- /dev/null
+++ b/to-lower-case/JeonBeomGu-S.java
@@ -0,0 +1,12 @@
+class Solution {
+    public String toLowerCase(String s) {
+        char[] arr = s.toCharArray();
+        for (int i = 0; i < arr.length; i++) {
+            if (arr[i] >= 'A' && arr[i] <= 'Z') {
+                arr[i] += 32;
+            }
+        }
+
+        return new String(arr);
+    }
+}