12 dazzling guys stand by Xiumin, Luhan, Kris, Suho, Lay, Baekhyun, Chen, Chanyeol, D.O, Tao, Kai, Sehun and 1 beautiful tomboyish girl, Yoona are friends. They are so close to each other since Yoona is very easy-going and bright girl. Jessica's sudden appearance makes her feel so small. She don't hate her, she's more to envy her. Jessica's beauty, Jessica's elegance, Jessica's politeness and Jessica's soft personality. Jessica is perfect for short. But not like any stories when the third character are mean, she's different, she is nice to everyone including Yoona. But it breaks her heart when EXO pay more attention to Jessica than her. Yoona felt like she was abandoned by them but she try to hide her sadness and jealousy in front of them. So, Yoona left them without telling for 5 years. But a lot of things happened when she's gone. There's someone that leave her a lot of questions when she met her after those 5 years. What happened during those 5 years exactly? What is EXO's reaction when they met her after 5 years? Does Yoona still upset about her and EXO's conflict? And where is Jessica? Who is the person that makes Yoona curious who she is? And will Yoona accept the fact that she actually fall in love with one of EXO member even before she left them?