Native name: 데프콘
Also Known as: 유대준;Yu Dae Jun
Nationality: South Korean
Gender: Male
Born: January 6, 1977

Defconn is a South Korean rapper and comedic television personality. He is one of the better known underground rappers in South Korea due to his parallel career as an MC.
In 2011, he became the host of MBC Every1's Weekly Idol alongside entertainer and comedian Jung Hyungdon, a show which was extended from an original six episode special to a weekly show that continues today.
In November 2013, Defconn became a cast member for the third season of KBS2's Happy Sunday segment 2 Days & 1 Night.