Summary: Kim Hyo-Yeon, a 17 year old girl who was trained to assassinate people at a very young age by a group who 'accidentally' killed her entire family while on their own mission. After all those years of training, she's wanted nothing but revenge for her family but knew too well that she still wasn't ready to attack a WHOLE group. With revenge on her bucket list, a mission comes up. This mission sends her into school, unfortunately for her though,

A young guitarist that goes by the name, H.Y. tries best to make it in the music industry. Like his older sister, Girls' Generation's very own Kid Leader, Kim Taeyeon.  He attempts to do so in the begining 'rock' band, 'Bruised Wings.' It's a failed attempt though since s have no intention of working together at all, fighting only for themselves to get attention and affection from any fan they have out there.