After waking up, one man is shown shirtless and another one in skimpy clothes (boxers and loose tank top). One of them is later shown shirtless in one more scene. That's all.

There is a lot of violence in countless scenes, from fist fights to shootouts and car explosions, with many people either dying or being injured, but there is no gore and very little of blood.

Not much. Several Chinese equivalents of "idiot", "shut up", "stupid". Nothing harsher than that.

Some cigarette smoking and alcohol drinking.