Yoon Yiyoung’s schedule is packed with work to the point that she hasn’t found the chance to go out on a date. One day her friend recommends her to attend a blind date not knowing that she would meet a man she once knew. That man was Cha Muyeol, the current director of S Group’s shareholding company’s headquarter and director of S Group Medical. They had also once shared a moment in their youth. After having separated and forging a path of their own for the past 13 years, Cha Muyeol had come to fulfill the promise they made in their past: marriage.