JYJ's Junsu and Super Junior's Eunhyuk showed off their long-running friendship!

Junsu tweeted, "My friend Hyuk Jae who came out to watch 'December' yesterday.. Although he's Eunhyuk now keke I'm still comfortable with [calling him], Hyuk Jae. My dearest friend!! Even now, whenever I'm with you, I feel like I'm going back to my elementary school days when I used to believe in Santa Claus... I am always sorry and thankful."

Eunhyuk showed his support for close friend and former label mate Junsu by attending his musical'December', proving that their friendship is still going strong.

[Thanks to everyone who sent this in!]