Kim Soon-kyung is a retired police officer and father of three sons, Geon-kang, Hyun-chal and Yi-sang.

Eldest son Geon-kang has experienced many trials and failures in life, including bankruptcy and divorce. He later gets remarried to his wife Chung-nan.

Middle son Hyun-chal is a successful businessman, the envy of the town and pride of his father. His wife Woo-mi often sacrifices her happiness for the benefit of their family.

Youngest son Yi-sang followed in his father's footsteps by becoming a police officer. But father and the son often clash, especially when Yi-sang marries Eo-young. Eo-young is the daughter of his father's deadly foe, an ex-convict Soon-kyung investigated and eventually arrested a long time ago.