Princess Serena of Atlantis with golden‑tailed fins was murdered in her past life by her adopted younger sister together with her fiancé. Reborn with burning hatred, she saw through their schemes. To escape the deadly trap, she dived into the abyss and united with Nereus, the sealed ancient Sea God, conceiving nine primeval divine eggs. On the grand birthing ceremony, she exposed the villains' plots. Joining forces with Nereus, she crushed her foes, abolished the hierarchical system separating humans and merfolk, and ascended as the Tidal Sea Queen to rule the deep ocean alongside the Sea God.