In the upcoming episode of KBS 2TV's 'Happy Together 3,' set to be broadcast on March 20, H.O.T's Moon Hee Jun admitted to having had the 'celebrity disease' in the past, meaning he was well aware of his fame and popularity, which got to his head.

He said, "I had the 'celebrity disease' during my H.O.T days.  I tried to be modest when I was outside, but as soon as I got into the SM office, I acted from that moment as if I caught the 'celebrity disease.'"

SEE ALSO: Actor Choo Young Woo's father revealed as 90s top model Choo Seung Il

He elaborated, "For no reason, I would walk very slowly and there was one door for five members, but I would always enter all by myself."

He also talked about how there were tons of fans in front of his house on his birthday when he was in H.O.T so he had couldn't help but to catch the 'celebrity disease.'  You can hear more about it when the episode airs on March 20 KST.