It's an AU story where Seventeen is not an idol group and just a regular person living their life. 

Clink the bell rings from the door being opened, informing that a new guest is coming into the store.

“Welcome to Le Ciel Café, how many person?” I said as I rush to the new guest, giving him a light bow and smile.

“Just one,” he said coldly as my head still looking on the floor.