Life has turned Yoongi into a loner and to some extent he'd rather to keep it that way. However, Jungkook happens, things get weird and well he ends up becoming the brat's diary keeper/guardian. 

A Love Like Medicine  Let the love I harbor for you be like medicine.   Let it diminish but never extinguish.   

  Your heart is enclosed by a thick wall to keep all the insults coming your way out, and all of the pain inside; to keep the tears from running down your face. Your fears of solitude come from long ago, but no one cared since everything said and done was merely child's play.