The Mermaid Says She's Repaying a Favor, But She's Clearly Here for Revenge!

A thousand-year-old mermaid was stranded ashore and rescued by a human girl. After a thousand years of cultivation, he came ashore to repay her kindness.

He turns into a puppy-like boyfriend, and they chase each other in a sweet romance.

You're so good to me. Why can't we be together?

The tsundere male lead has a secret crush on the female lead, and she likes him too, but doesn't dare confess.

Once she confesses, she'll lose the upper hand.

What will it take for them to be together?!