Cheaters (2006)

Seok-ho (Won-yeong Choi) is married to the beautiful Chai-young but when it comes to sex, she always has an excuse. While he maintains a sexual relationship with Ji-yeon (Da-mi Ko), she has been involved with his colleague Young-soo for quite a long time. All however have feelings for others and secretly pursue other interests. Unaware of their indirect interrelations, all involved are invited to a concert...