A thousand years ago, the Kingdom of Alister killed the child of an Abyss Sea Monster. From that day on, every king was bound by a terrible curse: one princess from each generation had to be sacrificed.
Marina, an illegitimate daughter of the royal family, agrees to take her half-sister Serena's place in a marriage to save her mother. But Serena secretly drugs her and forces her into a political marriage. Marina is unexpectedly rescued by Poseidon, the Sea King, and under the effects of the drug, the two spend a passionate night together.
Convinced that he is incapable of having children, Poseidon leaves Marina the Sea God's Tear as a token of their encounter. But Serena steals it, claiming to be the woman who saved Poseidon's life and presenting herself as his future Sea Queen.
Marina's mother sacrifices herself to save her daughter from being burned alive. Nine months later, Marina gives birth to six children, each blessed with a different divine power. Alone in a remote fishing village, she raises them herself. But the youngest, Little Six, is born with an incomplete divine bloodline and is left fighting for his life.
Six years later, Marina enters the Sea God's Medical Palace…
