Joongki met his first love again and the last time he saw her was in high school. Their separation was sad and tragic. Will he pursue her again?

      Hyeri is a transferred student from an all girls' high school, one day she had to move to SOPA (Seoul performing arts) to achieve her dreams to be a better singer, but what if one day, she woke up on her 18s (3rd year of high school) doesn't be able to remember anything about her 2nd year of high school including the big happenings of her schoollife and even her first kiss?

One day the reckless idol group girl's day moved to a house which has a model group of sensitive flower boys called play boyz on the second floor of it... What fate will both groups have?   Genre: Friends, Comedy, Romance   Casts: (Girl's Day)