Dai Meng, a lie-breaking expert who seems to be careless and hates lies, is good at observing and analyzing human psychology through micro-reactions and exposing the other party's lies. Dai Meng accidentally met the innocent and upright teenager Hua Sheng and accepted him as his apprentice. In a suspected marriage fraud commission, Dai Meng and Liao Duoduo, an emotional trainer who also knows people's hearts, met on a narrow road and became happy enemies who didn't know each other. As a result, the "Dai Duohua" trio was officially established. The trio went from opposing each other and concealing each other to gradually understanding and trusting each other, and in this process saw each other's true hearts. After experiencing a series of lie-breaking events such as "celebrity lies", "family lies", "health care product lies", and "artwork lies", the trio grew up in the noisy and noisy into a happy family who can fight side by side. The three assisted the police in solving many cases of fraud and black public relations rumors, but they were also targeted by the black hands behind the scenes and fell into danger. In the end, Dai Meng discovered that the "mysterious man" behind a series of rumors was the real mastermind of the 3.18 case that caused him to leave the police force that year! This time, Dai Meng no longer evades, and confronts the "mysterious man" head-on, rescues the kidnapped Liao Duoduo and Hua Sheng, and finally breaks through his inner demons, gaining love with Liao Duoduo and friendship with Hua Sheng.