Charmed Zaporozhets

A Cossack once stood on the shore and looked at the water, trying to catch a mermaid. But she took his reflection and went away with the man’s the soul. The mermaid fell in love with the reflection and did not want to let him go back to the land. What should the Cossack do? And how will mermaid fight the evil and harmful monster that inhabits the sea bottom and tries to lure her?