My Mother, the Mermaid

My Mother, the Mermaid is a 2004 South Korean romantic fantasy film directed by Park Heung-sik. It follows a young woman who quarrels with her mother but is somehow transported back in time and sees her parents' courtship. In her youth, her mother was a haenyeo, a traditional freediver.

Synopsis from Wikipedia, CC BY-SA 4.0. Everything below written here.

Poster © the film's rights holders.