Hana still seems to come up the most for foreigners, but I would trust the branch more than the logo. Branches near universities, big office areas, or immigration-heavy neighborhoods usually have staff who have seen the document mix before, so the whole thing feels less like you are teaching them their own process. I would also bring your work contract or school paper even if they did not mention it on the phone, because a lot of Korean bank openings get saved by one extra piece of paper at the counter.