Do you want to ask Wuji Tianxia Lei Mubai’s identity? The Holy Son of the Demon Realm. According to the Qidian Chinese website, Lei Mubai's identity is the Holy Son of the Demon Realm of the South China Sea. "Wuji Tianxia" is an oriental fantasy novel written by the writer Niu in the Cocoon. It tells the story of Lin Ming's chance to obtain the three artifacts in the world. The magical crystal magic cube in the world began its magnificent journey and became the story of the strongest man in the human race.