Martro Ido Central Branch

Martro Ido Central is a supermarket next to the fire station in Ido-dong, Jeju, selling produce, seafood, and refrigerated meal kits. The first floor holds dried fish, nuts, ice cream, and traditional liquor, while the second floor has dairy, ready-to-eat food, frozen fruit and vegetables, and meat, along with some Costco products. It is open 24 hours, so you can stop by late at night. Fruit is not cheap here.