As Sung-seok and Hae-joo go through with their fake wedding plans, they find themselves caught up in a whirlwind of events they never expected. Despite their initial agreement, they start to develop real feelings for each other as they spend more time together.
As their families become more involved in the wedding preparations, Sung-seok and Hae-joo struggle to keep up the charade. Their families are thrilled about the upcoming wedding, and their excitement only adds to the pressure on Sung-seok and Hae-joo to keep up the façade.
Meanwhile, Sung-seok's lover with a child and Hae-joo's plans to start a new career abroad begin to cause complications in their fake relationship. The truth about their hidden agendas starts to come to light, putting their relationship and the planned wedding in jeopardy.
As they navigate the challenges of their fake marriage, Sung-seok and Hae-joo must confront their true desires and decide what they really want for their futures. Will they be able to trade their love back to their original plans, or will they find that their fake marriage has led them to something real and unexpected?