Jonghyun and Key have been bffs since before they debuted so they've always been super close.
They're always hugging,
and holding hands,
and playing around,
|Key and Jonghyun at Heathrow airport as Kate Middleton and Prince William|
and Jonghyun is forever whispering to Key
Amongst other things.
Pepero fan service:
Source: derpkpopderp, gifs and pics credit where due.