세종문화회관
From December, 2013 - January, 2014 Park performed as dancer/chorus, with solo for the musical "December: Unfinished Song", written and directed by Jang Jin and performed at Sejong Center, with lead roles performed by Junsu of JYJ and actor/singer Park Gun-hyung. On March 14, 2014, Park announced on Twitter his sudden decision to enter the military, and entered quietly on March 18.