Tae finds out his wife Mimi is sleeping with his boss Yoongi, and the betrayal burns so deep it twists something cold and dangerous inside him. Instead of confronting them, he chooses revenge—quiet, calculated, and far more destructive. He sets his sights on Yoongi’s wife, Koo, studying her routines, her favorite places, the rhythm of her life until he knows exactly where to “accidentally” collide with her. Tae pulls her into something secret and intoxicating, telling himself every stolen moment is payback. But Koo isn’t just part of the plan, and as the lines blur, Tae realizes he’s no longer in control—because he’s starting to fall for her.