Seon-yeong's husband suddenly loses his job, so a friend introduces her to a sexy substitute driving gig. She hesitates, but decides to do it when she hears it makes more money than an average sub-driver. Then one day, Seon-yeong meets Dong-hoon, the guy next door, while on the job and they have an affair.

Jimin is married to Hyunsoo, a married man with a child. However, Wooyoung wasn't Hyeonsu's own son either. The age difference is so small that she feels uncomfortable in her relationship with Wooyoung. Meanwhile, Wooyoung feels love from Jimin. I fall into self-doubt because I feel that way with my mother, Accidentally finds out that he is an adopted child. He confesses his heart to Jimin..