Before becoming a singer in 2PM, Chansung was a television actor having played roles in MBC's 2006 comedy sitcom Unstoppable High Kick and then in KBS2's 2008 teen drama Jungle Fish. It was also during this time, in 2006, that he auditioned for, and was named, one of the dozen finalists (including his future bandmates Lee Junho and Taecyeon) to compete in the show "Superstar Survival".
In 2008, he took part in Mnet's Hot Blood Men which follows the extreme training of 13 trainees in order to become a member of the boy band One Day. One Day spawned two boy bands, 2AM and 2PM, of which the latter one Chansung became a member of. Six months after Hot Blood was aired on TV, 2PM debuted with their first single "10점 만점에 10점" ("10 Points out of 10 Points") from their first EPHottest Time of the Day, but it wasn't until their second EP 2:00PM Time For Change which skyrocketed their success in the Korean music industry.
On June 1, 2012 JYP Entertainment announced through their official Twitter that Chansung will be opening a fitness center with his weight trainer, Hwang Mo. The fitness center is located in Nonhyun-dong (논현동), Seoul.