"Mermaid" has always been the most perfect lover in his heart. It always reminds him of the beautiful mermaid who saved him back then. The days he spent with her were the happiest times in his life. Ten years later, another "mermaid" appeared in his life. His heart beat for her and he took off her disguise. Why did she feel so familiar to him? He couldn't help but suspect that she was the mermaid of that year...