Sima Chun returns from military service and takes a job. After accidentally winning a massive lottery prize, he plans to retire in seclusion and enjoy the rest of his life. But his wife's lover frames him, accusing him of stealing the company's trade secrets, and the police take him away. To clear his name, he hires Chen Yuzhu, a top lawyer, at a hefty price. As they spend time together, they fall for each other. Before his case is even resolved, his former commanding officer, Ou Ping, recruits him to investigate a new kind of virus as an informant. Since the biological virus case concerns public health and national interests, Sima Chun readily accepts without hesitation, setting out on a very different path in life. To conceal who he really is, he has to abandon his former image as a law-abiding citizen. He gets into fights, infiltrates the underworld, and takes part in underground boxing matches, repeatedly provoking misunderstandings that bring undeserved shame upon his parents and family. He endures humiliation and hardship, putting on a carefree, pleasure-seeking front and living a life of luxury and excess, while neglecting his lover. He also starts a company, investing his own money and hiring employees to secretly gather clues. In the end, he uncovers evidence of the crime, helps the police solve the case, and clears his name. In secret, he helps poor villagers and gathers their leads, bringing wrongdoers to justice and ensuring corrupt officials and criminal gangs get what they deserve. He also quietly funds development in his hometown, invests heavily in rural education, and establishes a senior citizens' recreation center so every villager can enjoy a secure old age. Ultimately, he turns his hometown into a model village for the entire province.
