Iti linzheng asks how long it will take him to keep following him. He's going back to his hometown of yundian, and he wants to see his friend. He wants to know how he's doing in the South City squad. He tells lin that he heard that he doesn't like Bu chonghua, and that he needs to keep him safe. He also wants lin to know that he attended the same school, the same year, with different majors. lin says that he knows that he'll get along with him, but he also wants to make sure that he keeps a strong guard around him. It's not just a mission, he says, but also something that needs to be kept in mind. He says that jinhua and lin were both police officers, and both of their parents were officers when they were kids. Both of his parents died in the service of the police, and his parents adopted him. Song wanted to go into the police academy, but his friend wanted him to stay in the academy, since he didn't have a lot of backing in the city of jinhai, so lin can't do anything for him. So lin tells jin