Kyuhyun has a ert neighbor who likes to peeping to their house. Sungmin denies Kyuhyun's accusation. He isn't a ert. He's just having a crush on Choi Siwon, Kyuhyun's half brother. Sungmin feels broken heart when he finds out Choi Siwon is going to be engaged with his long time girlfriend. Kyuhyun just can't stand still and watch it, can he?