Yoona loves Donghae and is getting engaged with him. But then something devastating happens on their wedding day. Yoona then gave up on love because Donghae was the only one she ever loved. Then she bumps into a new man, taecyeon. She gets to know him better and their relation ship gets stronger. She starts to like him as they turn into good friends. But her rival, Nicole, also like taecyeon and tries to make him like her over Yoona. Will Yoona and Taecyeon's relationship be forever or will it be over. Also during Yoona's and Taecyeon's relationship, Yuri, Yoona's older sister, starts to like nichkhun, Taecyeon's best friend.