A jeonsegwon (registered jeonse right) needs the landlord's consent and costs 720,000 won in tax on a 300 million won deposit. A court-ordered lease registration needs no consent and totals 43,400 won — but only the jeonse right forces an auction without a judgment.
A tenant whose lease has ended without the deposit being returned can apply for an imchagwon deunggi myeongnyeong (lease registration order). With one landlord, one tenant and one property, the filing cost is 43,400 won.
The chaegwon-choegoaek on a Korean property register is a ceiling, not the loan balance. At the usual 120% setting, the principal is that figure divided by 1.2. On a 600 million won home with a 120 million won ceiling, the safe deposit line works out to 300 million.
If your Korean lease ended but the deposit was not returned, a court leasehold registration order preserves your priority rights so you can move out safely.