Sungmin started to date Yoona, but they broke up right away. Yoona didn't cry for nights like Sungmin did, he thought Yoona loved him, but she was with other people, "Friends" she called them, but she was getting alittle too friendly than she was suppose to be. Sungmin's use-to-be-best friend-Donghae was completely blinded by Yoona and her lies about leaving Sungmin because he abused her in many ways. How could Donghae believe Sungmin slapped Yoona in self-defense as an eyewitness? You can imagine who he believed that day, the story or the truth?

Eunhyuk's heart stops for a second when he sees Donghae, but it dies completely when he sees Yoona's arms locked with Donghae's. Sungmin never told Eunhyuk about what really happened between him and Yoona, he isn't going to waste his time and tell Donghae the truth. 

Donghae obviously chose the story from the truth, did he ever realize that his ex-best friend has a younger brother? Will he realize that they go to the same school together? Will he see through Yoona's lies? Or will he see the fake love she built up between them first?