One fateful Night with My Neighbor Boss

Yoon Ha-jung spends one night with Kim Tae-on, the chairman of the Woorim Group, and finds out afterward that she is pregnant. She gives birth to twins. Her stepsister Yoon Se-ra takes one of the babies, tells Tae-on the child is hers, and uses that lie to become his fiancee. Ha-jung loses the argument before she can make it, and she leaves Korea carrying what is left of her family. She comes back six years later as Arta, a perfumer with an international reputation and a nose good enough to open any door in the industry. Nobody connects the woman at the launch events to the one who left. She moves in next door to Tae-on and takes a position inside Woorim, close enough to watch Se-ra keep up the performance of being a mother to a child she stole. Se-ra has spent six years building a life on that one lie, and every day Ha-jung stays in the building is a day it comes closer to collapsing. What Ha-jung wants is not the marriage or the company. She wants her son back, and she wants Tae-on to understand exactly what he agreed to when he believed the wrong woman.