Kim Jae-duc (born August 7, 1979) is a Korean singer, choreographer, and rapper formerly from the group Sechs Kies, now working under Kiss Entertainment. During Sechs Kies, he was choreographer along with fellow Sechs Kies member Lee Jae-jin. They both created the dane moves for most of Sechs Kies music videos. He is known by his Busan accent. His nickname was "Ducky" as a reference to his name Duc by adding K and Y to the end.