High school student Sohee starts job training at a call center, but she faces pressure of greedy company. Detective Oh Yu-jin, who has something in common with Sohee starts to follow traces to reveal the truth.

Do-Hee experiences family violence. Young-Nam works as the head of the police substation. She tries to protect Do-Hee from her violent stepfather Yong-Ha. Though Do-Hee looks naive, she hides a secret. Young-Nam becomes involved in a case with her life at stake.