introduction

kang seulgi a student in SM university, his friends irene,jay,wendy,yeri and otherp students look at seulgi as a cheerful friend yet she tries her best to increase her grades she is always distracted by music thats why she is one of the 7 mysteries in her school for being able to stay there, but what if the happy seulgi changes after an unwanted event by her
grandmother. How will she turn out.