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

SEE ALSO: Junsu captivates with his special album release for musical 'December'

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!]