JYJ's Junsu treated fans at '2016 XIA THE BEST BALLAD SPRING TOUR CONCERT vol.2 in JAPAN' with a live performance of his song for 'Descendants of the Sun'. 

During the concert on March 30, Junsu had 'Genie Time' where he granted 3 wishes from his fans. One of them was for Junsu to sing the OST live at the spot, and Junsu commented, "'Descendants of the Sun' is the hottest drama in Korea right now. The OST I sang is not officially released yet, but it's amazing how even the fans in Japan know about it. I think this will be the first time I am singing the song live." 

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Junsu's fans were overjoyed at his first live performance of the OST, but it looks like we'll have to wait to hear the full song!