My Bargain Merman Is the Sea King

Disabled Noah is scorned by Julian, the merman his parents left him. He buys a cheap "flawed" merman, Caspian—the Sea King he saved as a child. After Noah sells Julian, his bitter ex unleashes a tsunami. Caspian summons his deep-sea kin, reveals his identity, and reunites with Noah. Together they raise their son Finn, happy in Tidehaven Town.