JYJ Junsu is next in line for 'Descendants of the Sun' OST. 

On March 18, C-JeS Entertainment announced the news on their official SNS. A picture of Junsu with bright red hair is seen reading over the lyrics. The captions followed, "Are you surprised? Please wait a little bit for the music. Coming Soon."  

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It continued, "Song Joon Ki x Junsu. The two together for OST is always right." This statement is referring to Jusun's past OSTs for Song Joong Ki's dramas, such as 'Sungkyunkwan Scandal', and 'The Innocent Man'.  

Junsu will once again sing for Song Joong Ki's drama, and yes, Song Joong Ki x Junsu are indeed always right. 

?? ????? ^^ ??? ??? ??????. ???. ???X??? OST??? ??? ??. ????? ???? ?? http://goo.gl/Dg0my4 I know, you must be very surprised! please wait a bit for releasing the song! It's always super right the meeting with XIAJUNSU & Song Joongki for OST #??? #XIA #XIAJUNSU #????? #?? #?????_OST #??_?? #??_????_???? #???????_??_???_OST?_??? #???_???_OST_???_?? #??????

A photo posted by C-JeS Entertainment (@cjes.tagram) on Mar 17, 2016 at 5:06pm PDT