Ga-In leaves a lipstick stain on Jo Kwon's neck

Jo Kwon and Ga-In, also known as the 'Adam Couple', thrilled their fans last night after performing�their rendition of HyunA and Hyunseung's "Trouble Maker" at the 2011 MBC Gayo Daejaejun. The sexy performance left fans hungry for more 'Adam' love, and Cho�Young Chul PD fulfilled their wish by tweeting a photo of the two together. He joked, "Ah, that mark on his neck.. is it Ga-In?" In the photo, a red lipstick stain stands out visibly on Jo Kwon's neck. Ga-In is seeing staring into the camera with a sly expression on her face, while Jo Kwon seems frozen with his eyes cast downward. Netizens commented, "I enjoyed the performance greatly. Trouble Maker is good, but the team work between the Adam couple was the best," and "Adam couple will never die. I was so happy to see this collaboration." If you missed their performance, check it out below! Source + Photo: Osen via Nate