No Looking Back: I Remarried Your Rival Uncle

After her fiancé Adrian betrays her with her stepsister Carmen, Selena, a noble mermaid, is framed, imprisoned and cast out. She escapes and marries his powerful uncle, Marcus. With his support, she rebuilds her fortune, exposes the royal family's lies, and rises from discarded bride to Queen of the Seven Seas—leaving Adrian to regret losing her in the rest of his life.