A dangerous relationship, which is sad and deadly at the same time, has begun! Dong-woo misses his wife Min-hee, who had spent a night with another man. Dong-woo continues this love and hatred for Min-hee and can't seem to tie the knot. One day, Dong-woo meets Yoon-seo, who was dumped by her boyfriend of 5 years. They comfort each other then realize only the deep sense of loss allows them to start a new love.