For a South Korean student visa, international students are generally required to show a bank statement of at least 18,000 to 20,000 USD, depending on various factors. This amount is meant to cover one year of tuition fees and living expenses. The bank statement must be recent, usually issued within the last 1 to 2 months, and can be from either the student's personal bank account or a sponsor's account (such as a parent or guardian). If a sponsor is providing the funds, a sponsorship letter and proof of relationship (like a birth certificate) must be included. The funds must be available in a savings or current account, not in fixed deposits or investments. Some universities or embassies may have slightly different requirements, so it's always best to confirm with the institution or embassy you're applying through.