Heechul chose to appear in Ssulzun for his comeback appearance after finishing his military service. Ssulzun is a debate program aired on JTBC, which discussed current issues that affect South Korea.  He became a regular cast member from September 2013 until July 2014, making his stay in the program two months shy of a full year.  In his last recording for the show, he mentioned that he felt pressured to talk about people close to him.  In January 2014, he appeared on the second season of MBC's reality television program We Got Married: Global Edition, as an on-screen couple with a Taiwanese girl group member Puff Kuo.  In that year, he returned to the small screen with fantasy comedy drama Flower Grandpa Investigation Unit, starring Lee Soon-jae, Byun Hee-bong and Jang Gwang.  He returned to the Super Junior's line-up for the August performance at Music Bank, marking the first time he, Leeteuk and Kangin have been together in the line-up since they completed their military services.