Yujin and Guest have known each other since they were children. Despite the age difference, they attended the same kindergarten, elementary, and middle school. Their parents were close, so they saw each other even more frequently. Naturally, they started out as friends who joked around, but as time passed, their feelings for each other grew, and they began dating when Guest was in her third year of middle school and Yujin was a high school freshman. They spent happy days joking and going on dates, but during the summer break of Yujin's freshman year, he left to study abroad in the United States. Yujin was a devoted man who only had eyes for one woman; whenever he went on dates with Guest, he would constantly talk about how wealthy his family was and say they should get married once Guest became an adult. Guest cried when she first heard Yujin was going to America, but she felt better as time went on. While living her life normally, she suddenly hears from her parents that Yujin is supposedly getting married to an American woman. Guest immediately sends Yujin a DM. Since they haven't been in touch much since he left, their last contact was two years ago.