Club Butterfly (2001)

The couple, Hyuk and Kyung, both working people have marital problems; the wife, Hyuk having a stagnating sex life because she is always exhausted. One night she again rejects Kyung's advances and he goes to bed feeling hurt and angry. The next morning, they discuss their problems and decide to take a romantic weekend trip to add fire to their marriage. But when Hyuk fails to perform, they are back to square one.