They are your friend since child but you go to different schools and maybe they forget you. But one day they move to your school and they become the popular, cold, rude and ignorant kids at your school even though when they were with you they were spoiled, cute , cranky and jealous and innocent but that all changed because they forgot you

"Hello student, today we have a new student" said the teacher

and the new student is your childhood friend renjun, jeno, jaemin and haechan but they are forgot about you