Harry Shum Jr.'s career began as a dancer, where he showcased his skills in various dance competitions and performances. His big break came when he was cast as a dancer in the popular television show "So You Think You Can Dance" in 2008. Although he didn't win the competition, his talent and charisma caught the attention of producers, which led to significant opportunities in the industry.
In 2009, Shum landed a role as Mike Chang on the acclaimed musical series "Glee." This role not only showcased his dancing abilities but also his acting skills, establishing him as a household name. His time on "Glee" opened doors for him in Hollywood, ultimately leading to roles in films and other television shows.