A Bittersweet Life

Kim Sun-woo (Lee Byung-hun) is a high-ranking enforcer and loyal subordinate of crime boss Kang, who assigns him to shadow his young mistress Hee-soo (Shin Min-a), fearing she may be having an affair. As Sun-woo follows Hee-soo, he becomes enthralled by her beauty and begins to question his loyalty to Kang. After discovering Hee-soo's lover, Sun-woo spares their lives on the condition that they never see each other again, earning her enmity.