Qian Feng, a stock trader who resigned due to depression, gradually recovered and opened a trading room by himself to avoid excessive stress, doing simple transactions every day. As time goes by, Xia Xia Chunyu, a half-hearted psychological counselor who wants to write novels, Dali, a veteran candidate who has repeatedly failed the judicial examination, and Xiao Ding, a work-study college student who occasionally comes to help, come to the trading room. The three and a half strange combination sometimes help Qian Feng's high school classmate, Criminal Police Captain Xiang Hu solve the case by providing some ideas and solving some unsolved major cases in the city. In the process of solving the case, several people also completed the sublimation of friendship and love and the redemption of their hearts.