Characters

yixing or lay(EXO)

joohyun(SPICA) 

naeun(A-Pink)

sehun(EXO)

hyeri(Girl's Day)

That great poster is thanks to Antidote Graphics :D If you want a poster click the link below

https://www.asianfanfics.com/story/view/732544/graphics-batch-02-o-p-e-n-angst-graphic-graphics-poster-posters-graphicshop-kaisoo