After a few years,(y/n) come back to korea for a trip.she have a memories about someone.. P/S: my first book so it must not be a good story

Chingu(친구)is a girl group idol who are just 14 years old and they are a bestfriend.They are so talented and being a idol. Main character: Chingu's member.(I'll tell on prologue) Exo member(Just D.O.,CHANYEOL,BAEKHYUN,KAI,SUHO,SEHUN)