Bad Girl , Good Girl

JYP High School, despite its popularity for having successful students, it's also popular for having delinquents. The unnatural balance between good and bad students makes it awkwardly a famous school attended by most of the students in Korea either angel-like or devil-like teenagers.

An 18 years old girl, Kim Dahyun who was an unnecessary delinquent, who liked to play truant a lot always become the target of the bullies in her class which she found so annoying to deal with. Though they never feel tired to irritate Dahyun, Dahyun never paid attention to their action as she is always punctual to her truancy and nothing matters more than that.

A big surprise to everyone, Dahyun actually had a twin sister who lived in their hometown together with their grandmother who had recently passed away. So, her twin sister was brought to Seoul and went to the same school as Dahyun. More surprises to that, her twin sister was actually the infamous bully, Kim Dahye at her former school and words about her had spread even before she came to Dahyun's school.

Anyone who was in their right mind might not want to have anything to deal with the twins except for the desperate bullies who wanted to non-essentially prove their power in the school. Though once again got ignored by the twins as the delinquent Kim Dahyun still sticks with her playing truant and Kim Dahye wanted to stop being a bully and followed her twin sister's step.

Being a bad girl doesn't mean they can't be a good girl, in which their friendship was saved by the notorious twins.