In Infernal Affairs 1, Chen Han doesn't know that Chen Yongren is undercover. He knew there was an undercover around him, but he didn't know who it was. He asked Liu Jianming to investigate the undercover. Liu Jianming found out that the undercover was Chen Yongren, but Liu Jianming deleted all the information that Chen Yongren was undercover. So Chen Han didn't know who undercover was until he died.

Infernal affairs 1 tells the story of two men with confused identities, the police and the underworld undercover. After fierce struggle, they are determined to find their own story. In 2003, the film won the Best Film Award in the 22nd Hong Kong Film Awards and the Best Film Award in the 40th Taiwan Film Golden Horse Awards, and Tony Leung Chiu Wai won the Best Actor Award in the 22nd Hong Kong Film Awards.

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Infernal Affairs 1 is a gangster film produced by Universal Asia Film Distribution Company in 2002, directed by Liu Weiqiang and Siu Fai Mak and starring Andy Lau, Tony Leung Chiu Wai, Huang Qiusheng and Ceng Zhiwei.

Ceng Zhiwei plays Chen Han, born in Wuhua County, Guangdong Province,1April 4, 953. China film actor, screenwriter, director, producer and host, member of Guangzhou CPPCC, honorary chairman of World Trade Federation, image ambassador and honorary chairman of Kanghong Chenxi Football Team.

1992 starred in A Tale of Two Cities with Alan Tam and Maggie Cheung, and won the Best Actor in the Hong Kong Film Awards. From 1995, he began to host the variety show Winner for TVB.