The use of "which" is so loose as to be effectively wrong. What it's probably trying to say is that his role includes direction of the things mentioned.
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park sang joonThen, I'd like to know whether I can take it that in my example, "which" means "the role of the art director"Even "the role of the art director includes sketched pages, color guides, etc." is not correct. The role of the art director includes direction or management of those things, not the things themselves.