Elena, a mermaid princess, is framed by her stepmother, has her memory erased, and washes ashore in the modern world. She has a one-night stand with the wealthy tycoon Kai, but, suffering from amnesia, she quietly leaves and raises her daughter Mia on her own. For four years, mother and daughter live in poverty, but when Mia is attacked, Elena kills her assailant in self-defense. She is then framed and wrongfully imprisoned. Mia is forced to enter an orphanage, where she unexpectedly reunites with her biological father, Kai. Kai uncovers the entire truth, clears Elena’s name, and devotes himself to making amends for the mother and daughter. Ultimately, Elena regains her memories of her true identity and, accompanied by her husband and daughter, returns to the mermaid kingdom to embark on a path of vengeance.
