hotfix : Main.jsx, Router.js

[joodongkim]

PR 타입(하나 이상의 PR 타입을 선택해주세요)

• [ ] 기능 추가
• [ ] 기능 삭제
• [x] 버그 수정
• [ ] 의존성, 환경 변수, 빌드 관련 코드 업데이트

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