Vocal duo 4Men member Kim Won Joo will debut as a musical singer for his first time.

From October 10 to November 2, Kim Won Joo will perform for the musical "Onjo."

The musical 'Onjo' takes time in the historic Korean times and is about a third son of the Korean King who faces battles against his brothers and falls in love with a woman.

Kim Won Joo took the role of Onjo, who merely wishes for peace in Korea.

Kim Won Joo said, "I'm nervous because this is my first time in a musical, but I'm also very hopeful. I will practice hard to meet with the audience, so please cheer me on and give your support."

Kim Won Joo was also at the press conference of 'Onjo' on September 17.