I never studied film formally at school, but as a kid, I spent most of my time in cinemas.

I think one day I can make a book about coffee shops in Hong Kong. I spent almost most of my time in coffee shops, in different coffee shops.

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.'

To make a film like 'The Grandmaster,' I know I'm not going to make just a standard kung-fu film; it's not going to be just tricks or like wire works. So I spent seven years on the road interviewing different schools and a lot of real grandmasters from Chinese martial arts.

My mother has a very big family in Shanghai, so I have, like, almost 40 cousins, so we stayed together all the time. So by the time I get to Hong Kong, I become the only child and the only one surrounded by adults, you know.