"Let’s have a child.” “Do you know how babies are made?” This is how the uneasy marital relationship that devours each other began. Seung-jae, the grandson of the group and in competition for successor, enters into a contract marriage with Yeon-woo, who grew up as the hidden daughter of a chaebol. She was chosen because he thought she was the best partner to obey his words and maintain a superficial marital relationship, but after marriage they began to seep into each other little by little. However, the two people are unable to completely open up to each other, misunderstanding each other, and the conflict deepens. Yeon-woo, who was trying to continue her marriage for Seung-jae, decides to end this marriage for him, and discovers the clues to the terrible incident in the chaebol family hidden behind the two people's marriage...