An Oriental fairytale follows the romance between a demon master and a merman. Their relationship started from that of control and being controlled. After a series of conspiracies and misunderstandings, they break free of the barriers between their worlds to become each other's salvation. There are only four remaining places in existence where the use of the ability to control monsters is allowed by imperial rule. In a certain region in the South lives a woman named Ji Yunhe. She is the most powerful demon master with the ability to tame any demon. However, she falls in love with merman Chang Yi and sets him free even at the expense of deceiving him while she becomes imprisoned in endless darkness.

In a world populated by powerful gods and warring mortals, two enchanted beings meet in a peace-filled realm: They are Su Mo, a prince of sea gods, and Bai Ying, a princess and descendant of a mighty sword deity. They are immediately attracted to one another and begin on a romance, unaware that they are effectively crossing enemy lines and sparking animosity between two warring factions. Their actions anger other deities and Su Mo is eventually expelled from the realm. Overcome with grief, Bai Ying attempts to put her existence to an end by jumping from a magnificent pagoda.

Tatsumi is a high school student who lives on his own, until a merman named Wakasa takes up residence in his bathtub. His solitary lifestyle is turned upside down by the self-centered (but handsome) new roommate.

Gu Ze Yi, the merman prince, was captured by the human woman Lu Miao Miao. Gu Ze Yi started a long journey of "chasing the beads." His three brothers made jokes in order to help the eldest brother retrieve them.