My Wife's Sister (2016)
Original title: 내 아내의 언니
My Wife's Sister is a 2016 Korean-language romance movie directed by Lee Sang-woo, with a running time of 1h 37m. It stars Lee Chae-dam, Kim Soo-ho and Min Do-yoon.
Ji-seon is living with her sister and her husband after a divorce. Her sister Ji-yeong leaves for a work trip and Ji-seon is at home all alone with her brother-in-law. The two can't hide their sexual passion and they cross the line. Every time Ji-yeong leaves, the two enjoy risky sex...