Having immigrated to Canada at a young age with his family, Alex rose to fame upon returning to South Korea as part of the group Clazziquai. The group’s popularity skyrocketed after featuring on the soundtrack of the hit drama series My Lovely Samsoon.
In 2008, the group announced a temporary hiatus, and its members debuted as solo artists, including Alex. In 2009, Clazziquai returned with the release of Mucho Punk.
Alex became part of the MBC reality show "We Got Married" and was matched with Korean trot singer Jang Yoon Jeong in the Lunar Special episode, and actress/model Shin Ae for the rest of the series. Alex and Shin Ae left the show after Episode 8 for Alex to record his first solo album Vintage Romance. However, due to popular demand, the couple reunited in Episode 13. Alex and Shin Ae made their exit from the show on November 16, 2008.