Liu Lang is a calculative lawyer willing to sacrifice everything to win his cases. However, his reputation is ruined overnight by a five-year-old boy who claims to be his son. To make a living and to figure out the relationship, Liu starts to work in a tiny legal firm that specializes in charitable cases. By accident, he cooperates with an ambitious rookie Lin Xiaoyan. In every case and challenge, they continue to clash between justice and victory at all costs.