On a stormy night, twin brothers are adopted by the Fat and Thin Kam Lan sisters and separated. Thirty years later, the elder brother, Cheung Yan, inherits his father's business and becomes the lord of Wutian Island, enjoying wealth and power. Influenced by customs, he develops a male-dominant personality. On his wedding day, he takes four wives, with the main wife, Yu Ruyu, being obedient and favored by everyone, just as her mother, Lin Xianghua, taught her. On her deathbed, Cheung Yan's mother...