Li Ming is a policeman and a good man. He's a double agent. On the one hand, he tipped off Ceng Zhiwei, but in fact, his ultimate goal was to make Ceng Zhiwei trust him and finally capture Ceng Zhiwei.
3. Andy Lau killed Dawn because of her split personality, and he took Dawn as Liu Jianming.
He has always wanted to be a good person, but people can't help themselves in the Jianghu, so it's hard to get out. He provided information to Ceng Zhiwei and got information from Ceng Zhiwei, so that he could make meritorious service and get promoted.
Chen is a policeman and an undercover who plays the black boss.
Dawn plays a double agent in the play.
Being in a perfect place, the highest of the eight hell layers, is called a perfect hell, which means suffering a lot continuously and being able to cycle for death.
Liu Jianming didn't die. He just apologized to Mary and Carina Lau. He always regards his present wife as body double of Carina Lau, and may leave a sigh to apologize to his wife. In fact, Mary Carina Lau really liberated Andy Lau by filming Andy Lau.
Only in this way can Liu Can Jianming be free, die and be reincarnated.
For Liu Jianming, living is more painful than dying.
You can watch Infernal Affairs again in the order of 2 13.