Singer Junsu reunited with a duet partner after 15-years at his own solo concert, 'XIA 2023 Concert Chapter 1 : Recreation'. 

On the first day of Junsu's year-end solo concert, the singer surprised fans with an unexpected, special stage. The singer performed a song released 15-years ago, "Timeless", a duet with his then SM Entertainment label mate, Zhang Li Yin. The Chinese singer, who most recently greeted viewers in Korea by appearing on JTBC's 'Sing Again 3', made a special guest appearance at Junsu's concert on this day, reenacting the beautiful duet stage from 2008. 

Many netizens were not only moved by the nostalgic moment, but were blown away by the impressive vocal performance, which you can watch below. 

Some commented, "I was there at the show and I was so shocked when the intro to this song came on...", "Their vocals are crazy...", "This duet is legendary", "The crowd's cheers when Zhang Li Yin came out TTTT", "I never imagined I would see this song performed by these two again TT", and more.