What is the relationship between Lu An and Fu Yu in Covering the Sky?

friends. Covering the Sky is a fantastic power novel by the famous writer Luo Qiu. In the novel, Lu An and Fu Yu are friends. Briefly, this is the world of Tianyuan, which can be turned into everything, and above Tianyuan, it is the wheel of life in special blood. Lu An is an abandoned baby, but he leads an unprecedented three-wheeled life.