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When a watch goes missing, Jo Eun-su spots a mysterious customer and boldly tracks him down. She then visits her mother, who shows troubling signs at home.

Jo Hui-su endures years of relentless abuse from Noh Jin-pyo, despite attempts to escape. When she reaches a breaking point, Eun-su steps into action.

After witnessing Hui-su's mistreatment, Eun-su teams up with her to stop Jin-pyo — recruiting one of Jin So-baek's employees to execute their plan.

A confrontation with Jin-pyo forces Eun-su and Hui-su to hurry and cover their tracks. But in trying to be thorough, they navigate several obstacles.

With their problem seemingly over, Eun-su and Hui-su attempt to rebuild their lives. But trouble soon finds Eun-su — and So-baek unexpectedly appears.

An unexpected visitor terrifies Hui-su, forcing her and Eun-su to handle a new crisis. Meanwhile, So-baek begins to question their strange behavior.

With Noh Jin-young on Eun-su and Hui-su's tails, So-baek offers his help. But Eun-su takes matters into her own hands, putting everyone in jeopardy.

Pressured by Jin-young, Hui-su does the unthinkable. Can Eun-su find a way out of their hellish situation and finally break the cycle?