Cha Hae-Sung and Kwon Do-Woon have been friends for 20 years. Their relationship changed completely because of a one-night stand. Hae-Sung had been with Do-Woon for a long time, so he was confident that even if they got physical, there would be no change in their feelings. However, if there was something Hae-Sung overlooked, it was that feelings are not something that can be judged so easily. Seeing Do-Woon, who seemed to have no intention of doing anything right, whether it was dating, marriage, or love, Hae-Sung decided to cut off his relationship with Do-Woon. One day, a new man named Park Seo-Hyuk appears and confesses to her. But now Do-Woon confesses to Hae-Sung too. Hae-sung is confused as to whether Do-Woon’s feelings are sincere… **Original Webtoon:** R19: [Naver Series](https://series.naver.com/comic/detail.series?productNo=12270411) R15: [Naver Series](https://series.naver.com/comic/detail.series?productNo=12270393) **Official Translations:** R19: [French](https://www.webtoons.com/fr/romance/toxic-friend/list?title_no=8804)