F.I.R. (飛兒樂團) is a popular Taiwanese music group. Renowned producer Ian Chen formed his own band and recruited the other two members to form F.I.R. They are well known throughout Asia with their hit "Lydia," which was the theme song for the Taiwanese TV drama "The Outsiders (鬥魚)." The drama was aired in Taiwan without revealing the singer of the theme song. Having a beautiful voice that asked for attention, the song attracted many fans, leading to F.I.R.'s big success when they finally debuted in 2004.