He is notable for his unique rapping. He attended Department of Theater/Acting in Dankuk University. Ahn holds American citizenship. He developed an interest from a young age, during high school, decided that he wanted to become a singer. Ahn was recruited without needing to audition. Ahn's professional career began as a rapper for singer Uhm Jung-hwa. From there, he became a part of the boyband g.o.d; the group went on the become one of the most popular K-pop groups in the 2000s. He released his album on May 28, 2007, featuring the digital single "If It Were A Dream". Additionally, he also served as a DJ on the show Kiss the Radio. Alongside his career, Ahn also took roles in TV shows and films. In 2008, he appeared in Crazy Waiting, also known as The Longest 24 Months. He appeared in the KBS drama, The Slave Hunters. He appeared in KBS Let's Go Dream Team! Was the leader of the team.