Mi-sook raised her son Tae-ho alone after being widowed early by her husband. Then there was a man who comforted her lonely heart, and he was none other than Hyeon-dong, her son's best friend! For his son Tae-ho, who still doesn't know anything about this, Mi-sook suggests that they go on a trip with her high school alumni, Se-ryeong and Eun-hye, and tries to carry on her dizzying relationship with Hyeon-dong.

Thanks to her wealthy father, Yoo-jin runs a coffee shop. One day she runs into childhood friend Mi-ae on the streets and they have a good time catching up. Mi-ae is currently unemployed and helps Yoo-jin at the coffee shop. Min-soo stops by the café to see his daughter, but realizes he feels rather too fond of Mi-ae, who welcomes him.

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.