Leeteuk, leader of Super Junior

Leeteuk follow auditioned Starlight Casting System in 2000. Through auditions that Leeteuk finally registered as a trainee at SM Entertainment talent agency. He has appeared once as a supporting role in the drama series "All About Eve" (2000). But once Leeteuk discontinue its activities in acting because they have to concentrate a period of training in SM Entertainment.

Leeteuk, leader of Super Junior

Because it is a member of the oldest and longest serving his training, Leeteuk SM Entertainment believed to be the leader of Super Junior. Leeteuk also joined in the sub-group Super Junior-T with five other Super Junior members.

The long duration of training undertaken Leeteuk gave him the ability to speak fluently in public. This makes it asked to be a broadcaster "KBS Super Junior's Kiss The Radio (Sukira) withEunhyuk, from 2006 to 2011.