Eight years ago, Ye Guo and Shen Jianan met on the train. Later, because of a difference in his thoughts, the two finally separated. Eight years later, he has become a people's policeman, but she does not recognize him. By mistake, she became his informant and came to Luo Xinyang, whom he had been investigating for two years, and the real conspiracy had just begun... (Don't be fooled by the introduction, this is really not a Hong Kong gangster movie, this is really an urban novel...)