Above the thundering sea, there is a group of ethnic groups abandoned by the land. They made boats their home, drifted along the coastline all their lives, and were not allowed to go ashore. They lost their surnames in the long years of ups and downs, and they were not allowed to intermarry with people on land. When the weather is fine, the girl named Xiao'an occasionally looks back. All she can see is the long and undulating coastline and the Qionglou and the city that are warmed by the sun. Xiao'an heard that the land is flat and has no waves.