The Yellow River, Yangtze River and Lancang River originate from one place, and the three surnames of "water mandrills" (Ding, Jiang and Yi) live along the river. What is a "water mandrill"? They can come and go freely in the water, and have the skills of geomancy, feng shui, and dragon hunting. Yi Sa, as the last water mandrill of the Yi family, runs an "underwater bank" business in the Lancang River area. During a "golden soup", Yi Sa met and rescued Zong Hang, who was carrying the Jiang family's ancestral tablet. In order to find the truth of the year and the "water spirit gall" that could save himself, Yi Sa trained Zong Hang to become a professional "water mandrill", and together with Ding Yudie, the water mandrill of the Ding family, the three of them went into the water and entered the "ancestral golden soup". And Ding Changsheng, the head of the Ding family, also coveted the "water spirit gall" in order to command the three major families. At the bottom of Gongting Lake, known as the "Bermuda of Asia", a fierce contest is about to begin...