During the reign of Emperor Wu of Tang Dynasty, Tang Ao, a scholar, failed in the imperial examinations and was depressed. At the invitation of his wife and brother, Lin Zhiyang, he sailed with a fleet of ships to do business and cruised around the four seas. He visited countries with different folklore, such as the Country of Gentlemen, the Country of Women, the Country of Adults, the Country with Two Faces, the Country of Intestineless People, the Country with Breast Piercing, and more. Many exciting and interesting things happened along the way.