diff --git a/cases/typia/src/index.ts b/cases/typia/src/index.ts
index a42175194..a823029a1 100644
--- a/cases/typia/src/index.ts
+++ b/cases/typia/src/index.ts
@@ -16,7 +16,7 @@ interface ToBeChecked {
 
 const is = typia.createIs<ToBeChecked>();
 const equals = typia.createEquals<ToBeChecked>();
-const stringify = typia.createIsStringify<ToBeChecked>();
+const stringify = typia.createStringify<ToBeChecked>();
 
 export function assertLoose(input: unknown): boolean {
   if (!is(input)) throw new Error('wrong type.');
@@ -34,7 +34,6 @@ export function parseStrict(input: unknown): ToBeChecked {
 }
 
 export function parseSafe(input: unknown): ToBeChecked {
-  const json: string | null = stringify(input);
-  if (json === null) throw new Error('wrong type.');
-  return JSON.parse(json);
+  if (!is(input)) throw new Error('wrong type.');
+  return JSON.parse(stringify(input));
 }