The first time he coughed, it was just a tickle in his throat Changkyun thought he was catching a cold, so he bought a medical mask to keep the others from catching a possible cold, or something potentially worse.

Hoseok was the first to notice the difference between the masks he has as well as the first to ask, giving him a glanced over in concern, "You good there, Changkyun-ah?"

"I'm good, hyung," his throat burned and the tickling got worse, but Changkyun bared with it, smiling visibly even with the mask on, "It's just a cold."

It got worse when his hyung grinned brightly, worries washed away by the confirmation of the younger, "Alright, but make sure to get lots of rest once you get home!"

"Thanks hyung, I will."