What does the dawn play in Infernal Affairs 3 do?

Yang Jinrong, played by Dawn in Infernal Affairs 3, is a policeman who is finally killed by Liu Jianming, played by Andy Lau.

Infernal Affairs 3: Liu Jianming was investigated by the police after being killed in Chen Yongren 10 months, and his mental state went from bad to worse, but he firmly believed that the situation would turn for the better soon. Yang Jinrong, the young superintendent, is an eccentric in the eyes of his colleagues. He is marching towards the top of the police force with excellent results. In order to find out Yang Jinrong's true identity, Liu Jianming began to investigate him. ?

Liu Jianming gradually discovered that Chen Han's old partner, Shen Cheng, was inextricably linked with Yang Jinrong. In order to kill Yang Jinrong and keep his identity from being exposed, Liu Jianming, who has been eager to be a good person for a long time, began to search for evidence after evidence, but always fell short when he was closest to the truth.

Extended data

Introduction to the role of Infernal Affairs 3;

Yang Jinrong 1

Yang Jinrong, a rising star in the police force, used to be a senior inspector of the Security Department (former political department). He worked in the police force for 10 years, and was responsible for carrying out secret tasks in the public security department. He solved countless cases, but he had no criminal record. According to the legend of the police force, he is ruthless, insidious and cunning, and he does whatever it takes to solve the case, and he has a lot to do with the gang leader Chen Han. After that, Yang Jinrong and Liu Jianming fought a life-and-death battle, and were finally killed by Liu Jianming.

2. Shen Cheng

Shen Cheng is a mainlander. He is a private entrepreneur in Taiyuan, Shanxi. He has a complicated background and is sitting on a huge sum of money of unknown origin. After Hong Kong's return to China, it became a new immigrant in Hong Kong, and was implicated in the underworld boss Chen Han at that time. The two men cooperated to establish the largest smuggling network in the Pearl River Delta, which seems seamless, but in essence they have their own plans.