Don't date my brother; date me.

Seunghyun hates losing, and so does Yujin. Afraid of losing his brother to Yujin, Seunghyun asks him out. And Yujin, wanting to make Seunghyun suffer, accepts. What could possibly go wrong? More importantly, who's gonna win?!

Original Webtoon:
Main Story (R15): Lezhin, Bomtoon, RIDI, KakaoPage, Naver Series, MrBlue, Bookcube
Side Story (R19): Lezhin, Bomtoon, RIDI, KakaoPage, Naver Series, MrBlue, Bookcube

Official Translations:
Thai: WeComics, Lezhin
Japanese: Beltoon, Lezhin, cmoa, Renta, Mecha Comic, Booklive, Comico, eBookJapan, Honto
Others: English, S.Chinese, French, German

Note: The Side Stories are R19/Mature and have their own page separated from the Main Story. The Side Stories on the Main Story page are the censored version