On December 23, Ailee held a concert titled 'HER' at Sejong University Hall and during the event, she took the time to dedicate her song "One Step Closer" in honor and to show respect for Jonghyun. 

Also, it's been said that Ailee tends to wrap her concerts with an upbeat paced track but made an exception this time to sing the wonderful ballad track.

Watch the clip below.

171223 Ailee Her concert: Ailee sang a song today in honor of Jonghyun. Before she sung the last song she said she usually ended her concert with a happy song. But because a dear friend, Jonghyun, left her she would sing a ballad this time. She sang ??? ? (One Step Closer)pic.twitter.com/24RBUZrIzi

— ??~ (@xKakarot) December 23, 2017