Oh Yeon Doo is a Korean language instructor who delivers online lectures – and has become a bit of an internet celebrity. Gong Tae Kyung, meanwhile, is a talented obstetrician and gynecologist from a prestigious family who specializes in infertility treatment. He has no intention of ever getting married. Both are happy with their lives and think they are successful. But then Oh Yeon Doo discovers that not only is her boyfriend of one year, Kim Joon Ha cheating on her; she is also pregnant from him, and it turns her perfect believed world upside down. Oh Yeon Doo's and Gong Tae Kyung's paths always seem to cross at the oddest moments, and each time they end up helping each other. So in order to escape an unwanted marriage arranged by his family, he decides to engineer a “fake” contractual relationship with Oh Yeon Doo, making her his "wife." But this move proves to be tricky because Jang Se Jin, Gong Tae Kyung’s brash first love, and Oh Yeon Doo's now ex-boyfriend and father of her child, Kim Joon Ha, want to have a say in all this. Will Cupid be able to sort out this tangled mess of romance?