Gogaek Sikdang is a Korean restaurant inside the customer support center at Jeju Dongmun Market, serving hairtail braised and grilled. The signature braised hairtail is simmered with radish in a sweet and salty sauce and eaten mixed into rice. A wait forms, but it clears faster than expected, and parking is usually at the Dongmun Market public parking lot. The braised hairtail's sweet and salty sauce is strong, and the price is on the high side.