This drama tells the story of a boy who becomes critically injured due to an incident of school violence and his family who seeks the truth and fights for justice in his name. Park Moo Jin (Park Hee Soon) and Kang In Ha (Choo Ja Hyun) are a married couple. Park Moo Jin works as a high school teacher and Kang In Ha runs a bakery. They enjoy their lives with their children. Their peaceful days soon turn into a hellish experience. Their son, who is in the 3rd grade of middle school, is seriously injured due to school violence. Park Moo Jin and Kang In Ha try to reveal the truth. Meanwhile, Oh Jin Pyo (Oh Man Suk) and Seo Eun Joo (Jo Yeo Jung) are a married couple. They are both from wealthy families. Oh Jin-Pyo is the chairman of a private school foundation inherited from his family. They have never experienced failure or lacked anything. They have a son who makes trouble. The parents coverup for their son’s misbehavior.

After a series of unfortunate events, Mok Hae-won quits her job in Seoul and goes back to Bookhyun Village, in Gangwon Province, where she briefly lived when she was in high school. There, she meets again her former classmate and neighbor, Im Eun-seob. He also came back to Bookhyun after leaving the village for a few years and now owns a bookstore.

Being bullied at school and suffering violence at home, Mi-rae, a middle school loner, lives on the border between reality and fantasy. The only places she feels restful are the computer game world, and the would in the novel she writes in her notebook. As her classmates Baek-hap and Tae-yang come close to Mi-rae, she gradually opens up her mind to them. In the meantime, the computer game service is terminated, and the world in her novel also disappears, leading Mi-rae to face a tough reality again.

A stranger arrives in a little village and soon after a mysterious sickness starts spreading. A policeman is drawn into the incident and is forced to solve the mystery in order to save his daughter.