To be sensation! Hello, I'm Jaeyoon! Lee Jaeyoon (이재윤) is a Lead Vocalist and Dancer of the boy group SF9. Growing up in the countryside of Busan South Korea, Jaeyoon is known for having a Satoori Accent and even having deep knowledge about plants and animals. Jaeyoon has sang OSTs such as for the drama “Girls Generation 1979” and "My Only Love Song".