The thing is, I do have an unexpired passport. But if I do try to renew my passport, then I need to go back to korea for the army. I wanna stay here and live as an American.
If that is the case in renewing your Korean passport then I suggest you just wait until you can legally adjust your status, then you can try to renew. An immigration attorney can probably help you get it if there is such a policy that requires you to return to Korea. So you shouldn't worry about it until then.