Is there a Korean duty-free shop in Jeju Island? Is it far from the airport?

There are two Lotte duty-free shops in Jeju Island. One is at the airport, which is very small, just to buy special products for the last time. . The other is Lotte Hotel in China tourist area. If you go out from Gate 5, you will see the No.600 airport bus. 3900 won to Lotte Hotel takes about 50 minutes. . In fact, the largest duty-free shop in Jeju Island is Silla Duty Free Shop, which is close to the airport and takes about 10 minutes by car.