Park Moo Jin and Kang In Ha are a married couple. Park Moo Jin is working as a teacher in a high school and Kang In Ha runs a bakery. Both of them enjoy their lives with their two children. Their peaceful days eventually turn out into a extremely bad state. Their son, who is in the third grade in middle school, is seriously ingured due to the school violence. Due to this, Park Moo Jin and Kang In Ha try their best to reveal the truth.
Meanwhile, Oh Jin Pyo and Seo Eun Joo are a married couple as well and they are both from wealthy families. Oh Jin Pyo is the chairman of a private school foundation inheirted from his family. Both of them have never experienced failure or lacked anything. They have a son who get into trouble and their parents try their best to coverup for their son's own mistake as he did not want to admit it and tried to blame it on his other friends.