A mermaid girl who has grown up against her age meets a handsome celebrity with a vicious tongue. A fateful encounter and a new love story against time! According to legend, mermaids grow in the opposite direction to humans. The life trajectory of human beings starts from childhood, while the life trajectory of mermaids slowly progresses from old age to youth. Ten years ago, Shi Nian was rescued by a mermaid with a crimson fish tail. She was so beautiful and dazzling that Shi Nian could never forget her. Lin Xingxuan is a trainee priest from the mermaid tribe and a genus of koi. The younger he gets, the more unstable he becomes. Ten years ago, she was beautiful and powerful. She saved Shi Nian from drowning and "molested" him inhumanely. Ten years later, in order to retrieve "Mermaid Tears", she approached Shi Nian again, but Lin Xianxian, who was as timid as she was with her age, was timid. She was afraid that her secret would be discovered, and she was also afraid that she could not suppress her beating heart when facing Shi Nian. You can only fall in love with someone once or countless times. Lin Xingxuan felt that she liked Shi Nian, but what she didn't know was that Shi Nian's love for her had never changed.
