I've always wanted to make a film about the Tong Wars, the rioting and the crime factions in San Francisco's Chinatown in the early part of the last century.

I'm not coming from film school. I learned cinema in the cinema watching films, so you always have a curiosity. I say, 'Well, what if I make a film in this genre? What if I make this film like this?'

The reason it takes me so long to make a film, the reason it gets so difficult, is that I'm trying to think of every film as the last one I will ever make so it can be the best it can possibly be. I don't want to have regrets or excuses or think, 'I can do better next time.'

I started out my career as a screenwriter and quickly discovered that adhering to a script isn't always the best way to make a film. You have to take into consideration the nuances of the characters and what the actors bring to their roles.

The Chinese government promised Hong Kong '50 years, and change.' And 50 years later, after 1997, will be 2046; I think, 'Well, that's a very interesting promise.' So I want to make a film about promise.

After the Revolution in '49, all the films were propaganda. They serviced the government and carried the message that the government wants to relay to the people. But I think, in the last 10 years, because the film market is opening and there's an expansion of all the cinemas in China, it's now a lot like Hollywood productions.