Eun-Soo works as a salesperson at a luxury department store. She has struggled with trauma since childhood. Her friend Hee-Soo lives with a similar pain, stemming from her own past. Hee-Soo was once a promising children's book author, but that is now over. She leads a hellish life because of her abusive husband, Jin-Pyo. Hee-Soo struggles to escape her husband's violence. One day, the two women decide to hatch a plan to end his life. Jin So-Baek, the CEO of Jingang Firm, sees through their plan and stands by them as a fervent supporter.