South Korean idol singer Lee Chang-sun, better known as Lee Joon, is famous for being a member of well known boy band MBLAQ for a period from 2009 to 2014. He is also known as a potential actor who has starred in various television dramas and films as well as appeared in many variety shows. Some of notable dramas he starred included "Here He Comes", "History of a Salaryman" and "Sent from Heaven". Throughout his career, he has gained some certain achievements, most noticeably, a Best New Actor nomination by the 51st Baeksang Arts Awards.
While attending Seoul Arts High School, Lee Joon practiced dancing and entered a competition in which he won the second prize. Despite being told that he had no talents to become a singer, an actor by his teacher, friends, Lee Joon was still determined to pursue his dream. He attended Korea National University of Arts, majoring in dancing.