InterX

The usage fee was cheap and it was very convenient since it's close to Seoul Station.

These lockers really saved my trip! The space is well-designed and large enough to easily fit a 28-inch suitcase and a backpack. The interface is very intuitive, supports multiple languages, and makes paying with digital wallets or credit card QR codes super convenient. The lockers themselves are clean, well-sealed, and secure with password and QR code unlocking, so there's no need to worry about losing a key. For anyone wanting to free up their hands to keep shopping after checkout or before a flight, this is an absolute must-have. Highly recommended!

When you exit through the ticket gates at Myeongdong Station exits 9 and 10, there is a shop that looks like a kiosk right in front where you can store your luggage. The price varies depending on the size, but the service was also very good.