The sushi restaurant owner fell in love at first sight... with a mermaid! Because of his stern look, Hae-beom is often misunderstood as a gangster. Sang-ah, a customer who helped Hae-beom once, was a mermaid, who needs human saliva to get his legs. Hae-beom selflessly proposes a kiss to Sang-ah, once a day, every day. "Sang-ah only needs his legs... but won't he like me someday?"