The koi thief Hongxiao steals the North Sea's Sea-Calming Divine Pearl and is exposed, leaving her baby Hongyu behind to clear her debt before fleeing. The North Sea lord Xuanyuan is forced to raise Hongyu. Lively and mischievous, Hongyu creates trouble everywhere and causes countless hilarious incidents. Later, Hongxiao reappears and takes Hongyu away, but Hongyu suffers greatly outside, prompting Xuanyuan to track her down and bring her back. Afterward, Hongyu settles down peacefully in the North Sea, and the two continue their lively and joyful daily life together.