HyunJin has an illness that makes it hard for him to breathe sometimes when he gets overly excited, worried, when he is sick, or even too much dancing can set it off. He takes medicine for it, but hates to take it sometimes because it makes him super tired. Chan has been away on a long trip for a show that he was casted in. When he returns, he immediately is over-joyed to see his friends. But that joy turns into concern when Chan finds out HyunJin did not take his medicine this morning. Or the whole week before. When Chan hugs HyunJin, he can feel the younger boy wheezing. The rest you can find out in this fiction.