An Affair (Movie - 1998)

Source

A story about forbidden love. Seo-hyun is a bored housewife living with her architect husband and ten year-old son. But when she meets her younger sister's fianc'e, Woo-in, her life changes forever. Because her sister Ji-hyun is too busy with work to prepare for her own wedding, Seo-hyun is left with the task of planning the wedding with Woo-in. It is love at first sight for Seo-hyun and Woo-in. The more they meet, the stronger their mutual attraction grows. They begin to have secret rendez-vous together at his place, a video game room, the earth science class room in her son's school. But Ji-hyun's arrival from the United States. makes the situation all the more unbearable for the two lovers. The two continue with the relationship, knowing full well the consequences of their deeds.