Yoo-ri, a seemingly model student from a well-to do family suddenly commits suicide. Detectives suspect suicide, but her mother Hye-young believes that Yoo-ri’s classmate Ye-na and homeroom teacher Gi-beom were the killers. As the investigation dives into the lives of these people, it spirals out of control due to conflicting statements between the three, but detectives find out that Hye-young caused cracks in Yoo-ri’s heart. Deeply believing that she was doing everything possible for her child out of love, can Hye-young uncover the truth behind her daughter’s death?

An expelled boxing champion, who now is a high-school teacher, witnesses intolerable violence and throws her first punch to build justice against it, while putting on a mask.

Aging assassin Hornclaw has seen it all, but she never expected to mentor a reckless rookie like Bullfight. As their unlikely bond deepens, cracks form in the underworld they navigate together. When Hornclaw discovers someone wants her dead, she's thrust into a deadly game of deception. With enemies closing in and trust in short supply, survival means staying sharp—both blade and mind.