The Man Living In Our House (movie, 2016)

Hong Na-Ri works as a flight attendant. Her mother passed away 3 years ago and she doesn't have any other immediate family members. Hong Na-Ri returns to her hometown to visit her mother's grave during her death anniversary. There, she sees a young man at her mother's grave. The man, Go Nan-Gil, introduces himself as her father. Before Hong Na-Ri's mother died, she married Go Nan-Gil. He now lives at her mother's house and runs the small dumpling restaurant that her mother ran.