Birth Name: Kim Sung Gyu
Stage Name: Sunggyu
Nicknames: Grandpa, Leader, Hamster, Honey Sungkyu
Birthday: April 28, 1989
Position: Leader and Main Vocalist
Height: 178 cm
Blood Type: A
Twitter: @kyuzizi
-He shares a room with Woohyun and Sungyeol
-When asked to choose between 4Minute's Hyuna and f(x)'s Krystal, he chose Krystal