Mine asked the bank statement 3 times too with this msg
1 . Other request documents ( Foreign bank statement in English (Maintaining cash balance more than 20,000,000 won each month for up to 3 months) with a letter from the bank stating the balance equivalent to Korean Won or Certificate legalized by Ministry of Foreign Affairs in Korea)
- my bank said no and I didn’t know how to get such certificate the bank statement So I emailed the embassy visa department and they helped me through the process