sentences:  We also meet Shin Yoon-soo (Myung Se-bin) and Seo Jin-hee (Lee Hyun-woo), both childhood friends of Seung-woo and each with their strengths, shortcomings, and past relationships with the main duo.As they learn more about one another and what it means to be married, Se-na and Seung-woo soon begin to argue and fight due to their differences, past relationships, mistrust, and their insecurities about the relationship.Their relationship deteriorates to the brink of divorce, not knowing whether they can overcome the obstacles that face them.