An Affair
정사 (original)
A married woman with a bratty son helps her sister in the U.S. move back to South Korea but begins a passionate affair with her sister’s fiancé.
Starring Lee Mi-sook, Lee Jung-jae, Song Young-chang, Jung Kyung-soon, Kim Min
Watch "An Affair" from streaming services Tubi TV, Imdb TV (Prime), Imdb TV released in 1998. It's a drama and romance movie, and has a rating of 6.8 out of 10 from Imdb which is usually fine for this kind of movie, and is currently available to watch for free.