The series is about an incident that takes place when the owners of the boarding house called 'Guest Summer Palace', which breaks stereotypes, and boarders with secrets gather to find Lee Seol who disappeared 13 years ago.

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.

Hee Tuu is focused on finding money to take a patient back home. Myeong Hee finds out that she got accepted in a university. Both Myeong Hee and Hee Tae are choosing their path to achieve their issue where they end up on a blind date.

Baek Beom has worked as a forensic doctor for 10 years. He has a bad personality, but he is excellent with his work. Baek Beom does not open his mind to other people. Eun Sol is a rookie prosecutor with a warm heart. She has a bright personality and she comes from wealth family background. The forensic doctor and prosecutor work together to solve cases.

Reunited in their hometown for their father's funeral, two self-interested brothers meet a peculiar woman who shares a huge secret about their family.