diff --git a/useCloned/3people.ts b/useCloned/3people.ts
new file mode 100644
index 0000000..c178acf
--- /dev/null
+++ b/useCloned/3people.ts
@@ -0,0 +1,31 @@
+import { MaybeRefOrGetter, isRef, ref, toValue, watch } from "vue"
+
+interface UseClonedOptions {
+  manual?: boolean
+  clone?: (source: any) => any
+  deep?: boolean
+  immediate?: boolean
+}
+
+export const useCloned = (data: MaybeRefOrGetter, options?: UseClonedOptions) => {
+  const { 
+    manual = false, 
+    clone = (source: any) => ({ ...source }), 
+    deep = true, 
+    immediate = true 
+  } = options || {}
+
+  const cloned = ref({})
+  const sync = () => {
+    // toValue는 getter도 처리해준다
+    cloned.value = clone(toValue(data))
+  }
+
+  if (!manual && (isRef(data) || typeof data === 'function')) {
+    watch(data, sync, { deep, immediate })
+  } else {
+    sync()
+  }
+
+  return { cloned, sync }
+}
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