Sister-In-Law's Diary

Gong Woo argues with her younger boyfriend, Gyu Won, and goes to her sister Yeon Woo's honeymoon home. Yeon Woo's husband, Jeong Hun, prepares some drinks for the sisters. Gong Woo and Jeong Hun end up seeing each other in their underwear and after getting drunk, they cross the line...
(Source: Hancinema)