
Ava, a fisherwoman from the slums who has endured humiliation for years, is forced to dive daily on the edge of deadly waters to pay off a sky-high usurious debt fabricated by her uncle Carter, a gang boss, in order to support her disabled father. Yet when she risks her life to retrieve a priceless "Aurora Golden Sturgeon," Carter not only seizes it for himself but also cruelly reveals the ugly truth: years ago, he forged a signature to embezzle 500,000 dollars of her father's workplace compensation. Carter even threatens to sell Ava's sixteen-year-old sister to overseas smuggling ships as a prostitute. Facing utter despair, Ava does not kneel and beg for mercy. Instead, she slashes her palm and swears a blood oath, cutting all ties with her parasitic family. Blacklisted along the entire coastline, Ava sails a leaky old boat straight into the "Demon's Grinder," a death sea region that can tear apart warships. In the abyss, she awakens a mysterious "Ice-Blue Gaze," enabling her to fend off deep-sea monsters with her bare hands. When she surfaces clutching a rotting, parasite-ridden dead fish, Carter mocks her as a fool who only fishes for garbage. But he doesn't know this is just t…