This manhwa is part of the Backstage collection, here are the other stories! https://www...

I also made a list where all of them are included!
https://www.mangago.zone/home/mangalist/2963518/

can you explain what is this backstage collection?

They’re all short stories with a common theme. The theme of this anthology is Backstage so it shows what happens backstage in the lives of actors, photographers, idols, athletes, etc.