In the movie Infernal Affairs, how many undercover agents did Chen Han arrange to enter the police station? Was it all eradicated in the end?

There were five undercover agents, all of whom were finally eliminated.

There is a scene in the movie where Lin Guoping talks with Liu Jianming, saying that there are five undercover agents in the police station, including you. But the names mentioned were: Liu Jianming, Lin Guoping, Jun Chen, and two others didn't show up.

Yang Jinrong is not a double undercover and spy, but a highly trusted person and a good man in the police station. His task is to get rid of spies inside the police station. In exchange, he provided some information to Chen Han, and Chen Han also provided him with information. For example, Jun Chen and later Chen Yongren were betrayed to Yang Jinrong by Chen Han in the battle at the dock.

Extended information 199 1 year, 18-year-old underworld member Liu Jianming (Andy Lau) followed the instructions of his eldest brother Chen Han (Ceng Zhiwei) and entered the police academy to study and became a police undercover. At the same time, another police academy student, Chen Yongren (Tony Leung Chiu Wai), was apparently forced out of school by the police, but in fact he was asked to work undercover in the underworld.

After graduating from the police academy, Liu Jianming successfully entered the police station, and his position was promoted step by step. He has become a member of Group A of the Criminal Intelligence Service. During this period, he used various opportunities to provide Chen Han with a lot of information.

In Infernal Affairs 3, Liu Jianming always wanted to be a good man. After Chen Han's death, all he had to do as a good man was to wash the bottom of the undercover in the police station, and Liu Jianming also wanted to wash the bottom, so after he killed Lin Guoping, Jun Chen also died, and there were two undercover besides him. When he was investigating the death of Chen Junzhi, he found that Yang Jinrong was suspicious, so he thought that Yang Jinrong was also washing the bottom, so he followed Yang Jinrong all the time and finally found himself forever.