Seohyun and Yonghwa were once High school Lovers and were going to get married When they got older. They got engaged and were going to get married but Seohyn got a chance to study overseas for 5 years in America and she did. Yonghwa tried to stop her because he wanted her to stay in Korea with him and be a family but in the Airport the day Seohyun was going to leave Yonghwa came and afsked her to stay. Seohyun gave him back her ring and turned her back around and left with yonghwa heartbroken. 

5 years after Seohyun is back in South Korea to attend her best friends wedding and they agreeto meet for the first time in 1 year at a cafe and When Seohyun Enter the door and see her best friend Soyu waves to her she walks by and hug her. They sit Down and chat suddenly the door to the cafe opens again and Soyu waves to the guy who enter to Seohyuns surprise it turne out to be Yonghwa.