You'll see what it's about in the story^^

 "Chanyeollie.. Is Luhan hyung right? I mean.. Are we too close..?" -Baekhyun. "No we are each other's besties, right?~ And who cares, what Luhan hyung tells you?" . . . Chanyeol and Baekhyun's friedship becomes more serious and they become more closely to each other..   Until one day it all goes wrong and everything turnes upside down.