The group debuted with their first album, We Hate All Kinds of Violence in September 1996, which was accused of being plagiarized and lawsuits were placed against them.

Despite their controversial debut, the group eventually rose to fame with their first hit, Candy and We Are the Future, which the latter won them a MTV award for Best International Video.

Moon attempted to establish a rock music career with his first album, Alone, but received criticism from the public.

In the same year, Moon appeared in sitcom Taehee, Hyegyo, Jihyun and took a break from the music scene.

bandmate Tony An and three members of disbanded or inactive fellow first-generation idol groups Eun Ji-won of Sechs Kies, Danny Ahn of g.o.d and Chun Myung-hoon of NRG starred in their own variety-reality television show Handsome Boys of the 20th Century.

He had conceived the idea following the success of Reply 1997 and invited the four other entertainers, all of whom were born in the same year (1978), to star in a reality version of the show.

The group, except Eun, most recently met at Moon's bachelor party which was shown on My Little Old Boy, the reality show that Tony An was participating in.

[10] On November 25, 2016, Moon announced that he would be marrying fellow entertainer Park Hye-Kyeong, also known as Soyul of Crayon Pop, who is 13 years his junior.