A musical penned by a drama student from Seoul living in New York and focusing on "comfort women" opened off Broadway on Friday, with the playwright aiming to educate audiences about females who were forced to work in Japanese wartime military brothels.

Dimo Hyun Jun Kim, the 24-year-old author and director of "Comfort Women: A New Musical," said he learned how few of his New York classmates knew about the subject when he first started an assignment for a playwriting class three years ago.

Kim said that he had asked them what they thought the term meant, and that most answered that it was women who are "comfortable."