No pun intended - the movie is based (loosely I suppose) on a true story or rather incident(s). Make of this what you will of course. I have watched my fair share of Hong Kong movies, this or the rest of the "series" was not amongst them, until the other day. And I have mixed feelings about this to say the least.
We get a few unlikely "heroes" (more like villains, which makes the whole things weird with no one really to root for) ... and their quest after crossing the border (Hong Kong was not really a part of China back then - it belonged to Great Britain - I don't have the specifics, but you can read up on it, if you are interested) ... and they have to earn money ... first a prison break, then a border break ... then a robbery and hit job ... so many things ... and so many crazy stunts. There is a scene (to name one) where one character runs into a car ... and I am certain they did not have permissions to shoot that scene on the road ... or that the car was a stunt driver ... the days of rebellion ... must have been nice (or not).
Actually one of the makers admitted (on the release by 88 Films), that they did not have any permission or that people actually thought what was happening was real ... and that if police was near them (the real one), they may have shot at them ... again this is insane to a degree - well you have to watch it to believe it.
Some amazing stunts, characters that are over the top ... and a few jokes here and there. With quite the excessive ending ... like it or not ... or maybe you don't even care. Still has to be believed and seen.