Ha Dong-hoon made his debut in 2001 with the album "A/K/A Check Up" as a three-person hip-hop singer group Zikiri, and appeared in many of his own music tapes. Then he went solo. In 2002, he appeared in the youth sitcom "NONSTOP3", in 2005, starred in MBC "The Sad Love Story" and "Rainbow Romance" which was popular with young people. In the same year, he participated in the movie "Love in Magic", and regularly appeared in the variety show "Infinite Challenge". In 2006, he participated in the movie "My Boss, My Teacher 2", "Holy Daddy" (protagonist), etc. In 2006, he won the Men's Excellence Award (Variety) at the MBC Entertainment Awards. In 2007, he made a guest appearance in the drama Li Zhu. In 2007, Haha released his second single, "You're My Destiny". I release the single in 2008. "No, I can't sing". In 2010, he regularly appeared in the variety show "Running man". He released the single Pot/Hangover, You Are My Destiny 2. In 2011, he officially created the mini album "Quan Ninomarley AKA HAHA Reggae Wave" in his own capacity. In the same year, he won the SBS Year-end Performing Arts Awards Best Artist Award. In 2012, he cooperated with former member TAW, "accoustic tuning time" (this one is in Hip-Hop style), and later combined with Korean reggae musician SKULL, released "Ya Man!" in 2012 and another single in 2012 Pat Pat (토닥토닥) (Feat. SoHyang), ACACIA (TAW & HAHA). He also had his own programs "Haha 19TV or below" and "Mom vs Son", which were later suspended due to personal planning. In 2013, he released "REGGAErilla" and the single Dunyan Cave Melody (with skull). In the same year, he won the Men's Excellence Award at the SBS Entertainment Awards.