A Bittersweet Life

Underworld enforcer Sun-woo's (Lee) unquestionable loyalty is rewarded by his mob boss when he's asked to keep an eye on his girlfriend Hee-soo (Shin) - whom the boss suspects of playing around. Sun-woo follows Hee-soo all over town and subsequently falls in love with her, but when she is caught in the act of cheating on the boss, Sun-woo does the unthinkable and grants her an act of mercy. The boss, who expects his word to be carried out to the letter, sends some hoods around to Sun-woo to extract an apology through torture. Sun-woo escapes and begins the long road to revenge, taking out everyone as he goes.