Characters introduction

Jeon Jungkook, is a person who does not get along with his family. One day, he was in an arranged marriage with a girl named Yoon Se Young. He had already had the person he loves but for some reasons, he accepted the marriage. But, he made a contract with his fiancée, the contract that lasts for 6 months. What contract is that? What will happen during those six months? What will happen between him and the person he loves?

Note: There's also Seok Jin story here. For Jin's readers, please start reading at chapter 23