Yu Zhongzheng was trapped by His father's strict discipline did not allow him to be deceitful and cunning, but he knew that he could not survive without such tricks. A Jing, a small gangster in the market, has no father and no mother since he was a child. He was called A Jing because he was picked up by someone by the well. He and Yu Zhongzheng have known each other since he was a child. Yulin is the young boss of Yahang, and she was forced to disguise herself as a man since she was a child. On this day, when Yu Zhongzheng was cheating, Yulin reintroduced it, and Ajing's master was killed because of this. Yu Zhongzheng was hit but inadvertently bumped into Yulin's identity as a woman, and was forced to marry by Yulin in order to restore the reputation of the dental practice. Qian Baoer is the daughter of the owner of the bank. She was engaged to Yulin since she was a child, but her father's bank went bankrupt and she was forced to become an oiran. She has a grudge against Yulin and Yu Zhongzheng. Ajing, who fell in love with Baoer at first sight, turned against Yu Zhongzheng because of this. With the help of Yulin, Yu Zhong became the host of a fair practice. They cracked many cases together, and eventually turned from friends into lovers