On the lawyer street of a second-tier coastal town, female lawyer Xiao Longnv (played by Gao Ye) opened a law firm above the bathhouse on the first floor. She used to be the signature lawyer of the most prestigious local Honghu Law Firm, but she resigned because of a just act in a case. However, after leaving Honghu, Xiao Longnv lost all her previous case sources. Because she could not afford the rent, she was forced to move back to her father Xiao Jun's house, who had always been at odds with her. Gu Miaomiao, an intern lawyer who voluntarily followed Xiao Longnv, Dong Beihu, who did not know each other, and his nephew Luo Zhi, who was a nail in the law exam, came to the law firm one after another and formed a team with Xiao Longnv. They experienced large and small legal cases with various human feelings in this small northeastern city. They help the weak and protect the majesty of the law with their own strength. At the same time, Li Xin (played by Han Dongjun), an elite lawyer of Honghu, Xiao Longnv's former colleague and childhood sweetheart, is also silently helping Xiao Longnv. After going through many cases, Xiao Longnu gained a deeper understanding of law and justice, emotion and legal principles, and also resolved the knot between her and her father Xiao Jun. The business of the small law firm is gradually flourishing.