Seems Yoochun congratulated Jung Juna on his upcoming marriage :)
(Juna, 12:31am KST) @6002theMicky Thank you~~~ You must be so busy…. Hwaiting till the very end (of your drama)!!!
(Yoochun, 6:46am KST) @Juna0465 ~^^ No problem at all?? haha I should be the one saying thank you~^^
cr: YC's twitter