On the verge of being sold off to pay her debts in the slums of Changseong, Jeong Hee-eon gets a second chance when gangster Lee Mugil hires her to work for him. Grateful and eager to prove her worth, she works hard by his side, slowly succumbing to the temptation of his warm presence. However, Mugil refuses to play the hero. The moment he senses her growing devotion, he turns cold, making a crude demand that forces Hee-eon to navigate a dangerous new reality with her morally gray boss.