In a world devastated by a nuclear disaster 400 years ago, the privileged few found refuge in the Ark, while the outsiders mutated into beasts. Helm, a young biologist in the Ark, lives a life of indulgence…or so it would seem. Reluctantly engaged in a power struggle with his own half-brother, Helm spends his days indulging in frivolity in an attempt to stay free from his brother’s clutches. Yet his life takes a surprising turn when a captivating outsider tries to hold him hostage. Faced with a choice, Helm escapes the Ark, only to realize that the dangers outside may be more treacherous than he ever imagined…

Original Webtoon:
R19: Bomtoon, Lezhin, KakaoPage, Ridibooks, MrBlue, Naver Series
R15: KakaoPage

Official Translations:
R19: English, T.Chinese, Spanish, Japanese
R15: Japanese

The official T.Chinese is uncensored.