Cha Minjoo, an easy-going girl who is touched by the smallest acts of kindness. Park Gihyeon, a bad boy who uses her only when he needs her. Expecting sincere affection from him made Minjoo feel ridiculous. Gihyeon left her in the worst possible way And returns at the most miserable moment. To propose an incomprehensible contract. "I want you to give me a child." "That's not necessary, I want to marry a good man...." "What I need is a child from you." People don't change easily. So it came to her as just another game of chicken. MinJoo decides to give in to Kihyun's demands. If he wants to use my body, then I can use his.