Yeon Jang Hwa is a more or less average college student: she attends a pretty good university, is not too ugly, and has a nice boyfriend. Her twin sister, Hong Reon, on the other hand, is the opposite. Being the good sister she is, Jang Hwa sets out to help her twin sister... but at what price? The truth is in the details.

Original Webtoon:
R15: Naver Series
R17*: Naver Webtoon, Naver Series

Official Translations:
R15: Thai, T.Chinese, Japanese

Note: The series originally released in 2016, as of 2020, the series has constantly been removed and republished on different platforms. Currently it's under Naver publishing.
Naver does not have the R19 version on either Webtoon or Series, the two links are basically semi censored (R17) versions.