I fell in love with my customer

Kihyun works at a convience store with Wonho and Minhyuk as his managers.
Shownu and Jooheon are Kihyun's co-workers. The pink haired fucked up his life at school. So he dedicates it for his curent job.
A custumer names Changkyun got his intereset. They became friends and have a crush on each other now.
It went like that for two years. Changkyun visited the store just for Kihyun. Until on a night a strange customar changes everything.