Four-year-old Mia, a adorable little girl, was playing hide-and-seek in her family's antique shop when she accidentally fell into a Victorian mirror, growing a pink-and-gold mermaid tail and crashing into the arms of Arthur, the formidable Deep Sea King! As a top-tier artifact restorer and single mother, Chloe resolved to protect her daughter's dual identity, teaming up with this icy and domineering sea tyrant. Together, they outwitted greedy relatives, braved perilous black abysses, and set out to recover three lost Sea Spirit Crystals to repair the collapsing time gate. Yet, as the crisis subsided and the two realms' passage solidified, a tall, impeccably dressed figure emerged from the impenetrable time barrier—King Arthur, who had endured the agony of shattered bones to step into the human world. What extreme and insane measures would this deep-sea monarch take to utterly upend the peaceful life of this ordinary mother and daughter?
