Family drama begins to center around an unmarried pregnant woman and an unmarried man who enter into a false contract which leads to them to romance, pregnancy, childbirth, and childrearing.

Oh Yeon Doo is an optimistic online lecturer who teaches the Korean language. After going through many hardships, she finally gets a stable home and career which allow her to prepare for marriage. However, a new dilemma of becoming a single mother occurs. That is when she meets her doctor, Gong Tae Kyung. Although he chose to be a misogamist, a man who wishes to avoid marriage and a woman who is willing to birth a baby without a father starts a relationship. Hence, the contract romance begins with the baby as collateral. Would their impudent lie be able to fool their families to the end?—KOCOWA