My Mother, the Mermaid « Movie from 2004

Na-young is tired of being around her parents, and the only thing she can look forward to is her upcoming trip abroad. However, one day, her father leaves home without notice, and her mother doesn't care to look for him.

With no other option, Na-young gives up her trip abroad to search for her father. When she arrives in her parents' hometown, she is shocked to meet her 20-year-old mother.