Cha Soon-bong (played by Yoo Dong-geun)'s wife died early, leaving behind three children, Cha Kang-sim (played by Kim Hyun-joo), Cha Kang-jae (played by Yoon Bo) and Cha Dal-bong (played by Park Hyung-sik). After countless hard years, Cha Soon-bong finally raised his three children. However, as time went by, Cha Soon-bong found that the relationship between him and his children became more and more indifferent. Cha Kang-sim is a strong woman in the workplace. Although her career is booming, she is inevitably subject to gossip from others because of her blank emotional life. Cha Kang-jae's upcoming happy life is completely disrupted by an "illegitimate child" he has no idea about. Cha Dal-bong is mediocre, but he is proud of his love life. When Cha Soon-bong learned that he had a terminal illness and his life was short, he decided to use "unfilial litigation" to give his children a last lesson.