Taejoon has it all: money, power, and a beautiful fiancée. He’s finally moving on after his ex-girlfriend died under mysterious circumstances four years ago. Yuri, on the other hand, is struggling to piece together her past after a traumatic memory loss. Apparently, Yuri looks exactly like Taejoon’s ex, and he’ll do whatever it takes to get her back. How far will he go to uncover the truth, and will Yuri survive his dangerous games?

Original Novel:
R15: KakaoPage, Naver Series
R19: KakaoPage, Ridibooks

Original Webtoon:
R15: KakaoPage
R19: KakaoPage, Daum

Official Translations:
R19: English, Japanese
Italian: Toomics, Lalatoon
B.Portuguese: Toomics, Lalatoon
French: Toomics, Lalatoon
German: Toomics, Lalatoon
R15: English

Note: The novel was originally R15, with an R19 version being released after it was completed. Though there's both an R15 and R19 version of the webtoon, the adaptation writer has confirmed both will mostly follow the R15 version. (Source)