He made his film debut in "Attack on the Pin-Up Boys", which was released on July 26, 2007. The film failed to attract viewers and was proven to be a big loss for SM Pictures. However, both versions of the film's DVD became best-sellers and were sold-out in both Korea and overseas markets.. He also stepped into the field of voice-over, contributing his voice for the Korean-dubbed version of the American live action/animated film "Alvin and the Chipmunks" as the main character, Simon, the eldest and the tallest of the Chipmunks, along with fellow labelmates Kangin and Shindong. Heechul also appeared as a radio DJ on SBS Power FM's "" with Park Hee-von from November 2005 until mid-2006. Moreover, he co-hosted SBS's weekly live music show Inkigayo as a substitute for Andy of Shinhwa, later going on to become a permanent host starting April 23, 2006. On May 4, 2008, Heechul left his position after hosting the show with Song Ji-hyo. He debuted as part of Super Junior sub-group Super Junior-T on February 23, 2007, performing the trot single "Rokuko". It was Korea's sixteenth best-selling record and the number one best-selling single of 2007. The debut also marked his comeback performance after recovering from an injury he had gotten in a car accident that occurred in August 2006. In November 2008, the subgroup returned with a debut in the Japanese music industry, releasing the Japanese version of "Rokuko", now titled "ROCK&GO". On August 29, 2007, he won an award under the category "Best Pretty Boy" in the first Mnet 20's Choice Awards. In May 2008, he played the role of Sonny in "Xanadu", the first production of SM Art Company, in rotation with his bandmate Kangin. The production ran between September 9 to December 28, 2008 at the Doosan Art Center, Yonkang Foundation, Seoul. Casting was carried out via a reality television programme, "To be Kangin and Heechul". In the same year, he co-hosted a program called "8 vs 1" but it was canceled due to low ratings. He later became a cast member on the shows "Good Daddy" and "Band of Brothers". In 2009, he starred in the surrogacy melodrama "Loving You a Thousand Times", which became the first Korean drama to be exported to Bulgaria. he released his first solo single, "First Star", on November 6, 2009, as part of the soundtrack for the drama "Loving You a Thousand Times".