Just like most of his other films, Wong Kar-wai's 2046 is about lonely people longing for love. Although comprised of an ensemble cast, WKW's 2004 feast of lost love has Chow Mo-wan (Tony Leung Chiu-wai) as its focal point. Yes. The same dude from Days of Being Wild and In the Mood for Love.
2046 is a blatant sequel to In the Mood for Love. It portrays Chow as a jerk who enjoys having casual sex with women, a self-destructive path he chose after losing his one true love: Su Li-zhen (a special participation by Maggie Cheung).