Longtouyan + Coastal Highway 2 million years ago, the huge volcanic rock formed after the cooling of volcanic lava in Hanrongshan met cyclists occasionally. Fig. 1 is the impulse to ride a bicycle. Long ago, Jeju Island was an isolated island far from land. Fishing in the sea was the main source of local life. Hainu became one of the three treasures of Jeju Island. Fig. 6 is the mascot of Jeju Island in Korea. He is the mascot of Jeju Island. The God of the whole island; named "Dorharu"; equivalent to the land lord of China