Mermaid Lyra, betrayed by Dorian, resolves to erase him in seven days. When Dorian turns a blind eye as Vivienne destroys Lyra's wedding dress and frames her, Lyra loses hope. At wedding ceremony, her memory pearl turns black. Faced with Dorian's proposal, she coldly asks, 'Who are you?' Dorian tries to win her back, but Lyra becomes human and lives with another, leaving Dorian to eternal remorse.