Min Gyu and Sang Hui are a happily married couple. One day, Sang Hui comes across her ex-boyfriend, Yeong Jun, and receives his business card. Min Gyu suspects that his wife might have an affair with her ex-boyfriend. Unable to bear it anymore, Sang Hui finally leaves home. Yeong Jun meets with Min Gyu to tell him that nothing is going on between him and Sang Hui and blames Min Gyu for his narrow-mindedness. Min Gyu regrets his hasty judgment and accepts Sang Hui warm-heartedly.