Underrun, Ui-chan, Jeong-bae, and seminars wonder how a baby looks and is born. The children ask the questions and embarrasss them, saying that when they plant seeds in their mother's belly, the baby will grow and be born. The children believe in the words of the five and put the chocolate on the underbelly to give birth to the baby waits for the baby to come out. Concerned about this, Mi-sun, Young-kyu and his family prepare sex education plays for their children. Chang-hun is reluctant to be asked for a friend and senior wedding society on the same day, and the worst happens on the day of the wedding. (Source: SBS)