Ta-da! A legendary mom who was a delinquent teenager goes to school to take it all! In a grey world of children marked with wounds, they are the mirrors of adults. Other main characters here are teenagers. Like the lyrics of a popular song children sing, the world is full of lies, and the school has become a prison without bars. Children do anything by fair means or foul for grades, deceive teachers by claiming parental authority, extort money from friends, and engage in violence. However, the world of such children is drawn here as it is, but the focus will be on the distorted portraits of adults that it reflects like a mirror. We should consider what a good adult is through the two faces of a mother who becomes a scary knife before corruption but a warm kitchen knife to children who are in despair for affection.

Eun O, a son born out of wedlock of the former Chancellor Kim, travels around the nation as he is interested in nothing, even women, money, or fame. Since his childhood, Eun O has been able to see and talk to ghosts, and this ability has bothered him so much. Eun O meets A Rang, a clumsy, brazen, yet lovely ghost. A Rang strives hard to find out who she was when she was alive, only to face despair. But she teams up with Eun O, a district magistrate, clears up cases one by one, and gets close to a big shocking truth.

Woo Ri, an intelligent 9-year-old girl, never knew her father's name. She stands by her deaf mother's side with Young Gyu, a not-so-smart man who falls in love with her mother, and Ma Ru, his son. A man who hopes to inherit his grandfather's company running by his stepfather named Dong Joo meets Woo Ri years later. He teaches her how to play the piano. In a world of uncertainties, the two now learn to listen to each other's hearts while plotting revenge against Dong Joo's stepfather.