Everyone around you are suspect. Everyone have reasons to kill you. But who actually did it ?

Lee YeSeul is the ' it ' girl at Korea National University of Arts. She's the top student in her department which is Vocal Music. Every guy in college would love to date her. The only thing is she is the regular type of popular girl we saw on TV, mean, a bully, call people names and whatever you can to describe a mean girl. But that stops when she dated the gentleman Hong JiSoo or Joshua. He changed her. She's not how she used to be. Students are not afraid of her anymore. She became the good girl. But once she turns angelic, some people take the advantage for revenge. Just as Joshua had to move to overseas, she gets tons of blackmail, cyberbullied, basically what she did to other people back then, now she faced the same thing. Karma's a . Until one day, her heartbeat stops, she stop breathing, she can't move her body anymore. She is dead.