Irreversible(돌이킬 수 없는)

Poor car salesman Eun-seong always leads a poor life. One day, Eun-seong goes to a luxury pension run by her girlfriend, Hwa-jun, who is not able to overcome her lover Yeon-hee's Seonghwa. However, Eun-seong and So-jeong have a bitter quarrel there, and Hwa-jun approaches Yeon-hee by taking advantage of the opportunity...