Jeon Chae ri is a nerd who goes to seoul high. She has no friends at all, her brother Jeon Jungkook who is 2 years older then her is in a gang, his group is rival with another group at Chae ri's school. What happens when Chae ri is brought into something she never expected, she becomes friends with UNIQ the bad boy "gang" at school after Chae goes into the middle of what was unexpected, Her brother's gang and UNIQ. Her brother's gang dont know Chae ri is Jungkook's sister, Chae ri and Jungkook have to keep it secret.

What happens if one of UNIQ start to fall for Chae ri? will they find out her dark secret and turn on her or will they stay? Will her brother's gang figure out who Chae ri is and turn against Jungkook?