Maybe

Heesoo Lee was shocked to see an email from his boyfriend who died in a tragic accident a year ago. He told himself it was a prank, but the ghostly visits every night were impossible to explain. With no one else to turn to, he reached out to the internet and connected with Yihyun Paek. Once Yihyun realized the dangerous situation Heesoo was in, he agreed to help. But nothing seems to be able to stop the ghost from coming each night, and it’s getting more and more violent with every visit…

Haeseo is deeply moved when the little boy he saved long ago, Taegun, returns to the seaside where they first met as an adult. Although Haeseo reunites with Taegun in his human form, a mistake reveals the truth that Haeseo is actually a mermaid to Taegun, and slowly, Taegun's violent obsession starts to show. "If love between a mermaid and a human is not sincere, the mermaid will disappear into the seafoam." As Haeseo's doubt of Taegun's affection grows, he realizes the curse that has befallen him.