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**This door must be opened!**. In a world where the space behind each 'door' is randomly shuffled every time it is opened, students who have survived must find a way back to their families. To return home, they must open that 'door.' **Original Webtoon:** [KakaoPage](https://page.kakao.com/content/65405294), [Daum](https://webtoon.kakao.com/content/%EB%AC%B8-%EB%92%A4%EC%97%90-%EC%A7%80%EC%98%A5%EC%9D%B4-%EC%9E%88%EB%8B%A4/4296) **Official Translations:** [Japanese](https://jp.piccoma.com/web/product/177070)
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**This door must be opened!**. In a world where the space behind each 'door' is randomly shuffled every time it is opened, students who have survived must find a way back to their families. To return home, they must open that 'door.' **Original Webtoon:** [KakaoPage](https://page.kakao.com/content/65405294), [Daum](https://webtoon.kakao.com/content/%EB%AC%B8-%EB%92%A4%EC%97%90-%EC%A7%80%EC%98%A5%EC%9D%B4-%EC%9E%88%EB%8B%A4/4296) **Official Translations:** [Japanese](https://jp.piccoma.com/web/product/177070)