Shao Chen, a top killer, faked his death and retired, and accidentally entered Shen's family, turning into a useless son-in-law who was allowed to be bullied. He originally wanted to live a stable life, but unexpectedly discovered the secret of his father-in-law Shen Wanshan's smuggling of arms, and was even involved in the whirlpool of the organization's pursuit and the Black Crow Group. Faced with the humiliation of his father-in-law and the ridicule of everyone, Shao Chen pretended to obey and secretly investigated and collected evidence. The appearance of an old acquaintance reveals the truth behind the murder of his parents, and the high price of the reward makes danger lurking everywhere. While maintaining his cowardly image, he broke the situation as a killer, protected Shen Zhiyi, opened a smuggling den, and launched revenge on the Black Crow Group and the mastermind behind the scenes.