"There's an economy in sports that I always think is a useful metaphor for acting. You have an objective. You're trying to win, and of course, you want to do well. You want to use good techniques so you enforce it, but also you don't do things you don't have to do. It's very economical, and I think that in acting the most economical way through a scene is always the best. It's active. There is the sense of the fight and you want to win."

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But when there were certain moments or scenes that required a very specific nuance or performance, I myself would act out the scene or the sequence and that would inspire the actors. Of course, I can't really express emotions on camera, but I was very active in showing a certain action or a blocking for an actor. I would also participate in certain stunts myself and because of that, I would get bruises or cuts on my knees and elbows.

— Kim Jee-woon