Kwon Si-Hyun bets his life on a dangerous game to seduce Eun Tae-Hee. His target is 20-years-old and believes people that are swayed by love are pathetic. After Eun Tae-Hee meets Kwon Si-Hyun, her view on love changes. Based on 18th century French novel “Les Liaisons dangereuses” by Pierre Choderlos de Laclos.

Boo Yong Joo was once a famous surgeon at the peak of his career at a major hospital. But he suddenly gives it all up one day to live in seclusion and work as a neighborhood doctor in a small town. He now goes by “Teacher Kim” and refers to himself as the “Romantic Doctor.” Meanwhile, Kang Dong Joo became a doctor to make something of himself after growing up poor, and he seeks out VIP patients to achieve the success that he desperately wants. Yoon Seo Jung is a passionate young surgeon who is haunted by a mistake from her past and tries to get over it. When Dong Joo and Seo Jung meet the quirky Teacher Kim, their lives and careers will never be the same again.

Due to an unplanned pregnancy, Ha No Ra married young and dropped out of school. But after two decades as a housewife, she finally gets the chance to experience college, alongside her 20-year-old son Kim Min Soo and his girlfriend Oh Hye Mi. Further complicating things, No Ra already has a strained student-teacher relationship, as her husband Kim Woo Chul and her first love Cha Hyun Suk wind up being her professors.