Storyline:
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-Seok) and Seo Eun-Joo (Cho Yeo-Jeong) 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.