Perfect Transit Sex.

Ga-yeon is tired of her kind and innocent husband, Shin-woo, so she has an affair with adulterous man Dae-ho. As soon as Shin-woo goes on an overseas business trip, Ga-yeon calls Dae-ho home and lets him disguise himself as a robber and have sex with him. However, Shin-woo suddenly returns home and witnesses the affair. He suffered from guilt when his wife had sex with another man in front of him. In the end, Ga-yeon leaves home, and Shin-woo, who thought he would have a hard time without her, is rather happy.