How do i turn my Korean BFF into my BF?

My best guy friend is a korean guy who ive had a crush on for awhile. I tell him almost everything and he claims he tells me all too (uh huh..ya-___-) but he likes another girl who has a bf but he still likes her alot. He tells me im the best girl ever and the perfect best friend but I want more. And I want him to like me the same way. Some of my friends think the only thing keeping us from being ty ogether is a cultural but idk. Please tell me how to win him over. :)