Lee Jae-yoon, best known as simply Jaeyoon, is a South Korean singer and performer. He's a lead vocalist of SF9. Jaeyoon was born on August 9, 1994 in Nam-gu, Busan, South Korea. He has a younger sister.
- [2017.09.13] Lingerie Sonyeosidae OST Part 1 (란제리 소녀시대 OST part 1)
- [2017.06.09] My Only Love Song OST (#3 "Gomaun Nae Sarang")
III. CINEMA / TELEVISION
-  Click Your Heart
IV. MUSIC VIDEO COVERS
- He used to live in the countryside, so he can distinguish poisonous plants and animals from those that are not poisonous.
- He has a bright personality.
- He is afraid of heights.
- He loves bread, coffee and chocolate.
- He is in charge of "honey voice" in the group. He can sing any song in a sweet way.
- He thinks his best trait is his butt.
- He used to work part-time at a spicy stir-fried chicken restaurant.
- He has very deep dimples.
- On SF9, he's on the Vocal line with InSeong, DaWon, RoWoon and TaeYang and on the "Hyung" line with Young Bin and In Seong.