The third princess of the Dragon Palace of the East China Sea, {Hai Ruoyan}, has been trapped in the glass cage of the Crystal Palace since she was a child. She is tired of the rules of the Dragon Palace that have not changed for thousands of years, and yearns for freedom in the world and the legendary immortal way. She secretly took off her dragon girl's attire, turned into a fisherman girl and slipped out of the East China Sea. In the human world, she meets a down-and-out scholar who cares about the world, a knight-errant who enjoys grudges, and a disciple who is a cultivator of the sect. She travels with them in the streets and mountains, and experiences the joys, sorrows, and joys of the human world. A sudden vision makes her realize that the East China Sea is about to face a catastrophe, and the mastermind behind it is actually the fairy water god who controls the waters. The journey of seeking immortality in the past suddenly took a turn, and {Hai Ruoyan} resolutely gave up the freedom of the world and returned to the East China Sea. She unites her dragon clan members, gathers close friends in the world, and shoulders the heavy responsibility of protecting her homeland with her young shoulders. There was a duel between immortals and demons, and dragons roared across the sea. In the end, she not only defeated the water god, but in the process of protecting and growing up, she understood the true meaning of immortality and became the true patron saint of the East China Sea.