Lee Hong-gi (; ] ; Japanese:イ•ホンギ) is a South Korean singer-songwriter, actor, writer, and fashion designer. He is best known for his singing abilities and being the main singer of the South Korean rock band F.T. Island. Lee released his first solo extended play "FM302" in South Korea on 18 November 2015 and his Japanese album "AM302" on 9 December 2015. Using only the above description and what you know about the world, "Lee is a backup singer for F.T. Island." is definitely correct, incorrect, or inconclusive? 