Sammi Cheng. Andy Lau likes to cooperate with Sammi Cheng best. Andy Lau and Sammi Cheng both acted in Infernal Affairs, Infernal Affairs 3, Lonely Men and Few Women, Slimming Men and Women, Magic Kitchen, Dragon and Phoenix Fight and Blind Detective. The two cooperated a lot and had a good personal relationship. Andy Lau's attitude towards Sammi Cheng is different from others. Andy Lau, who has always been polite, neglected the image in front of Sammi Cheng. They often show intimacy in front of the media and are close friends.