Adam couple Brown Eyed Girls member Gain and 2AM Jo Kwon is becoming an issue for their kiss-proof photo.

The photo was revealed through Loen Entertainment producer Jo Young Cheol's Twitter account. On the 1st he posted on his Twitter "ah that mark on his neck... Gain ah..." along with a photo.

This photo was taken right after the seductive performance of the couple to the song 'Trouble Maker' on 2011 MBC Gayo Daejaejun.

The photo contains image of Jo Kwon and Gain. Gain, with her black see through outfit, is smirking with an arm on Jo Kwon's shoulder. Jo Kwon is standing with his chin raised, as if he's showing off the kiss mark on the side of his neck.

Netizens who saw the photo commented "Adam couple kiss proof photo, wow", "I was so taken back when I watched the 'Trouble Maker' performance", "I hope they get together", and etc...

The two gained the nickname 'Adam Couple' through their appearances on the show 'We got Married'.

Photo Credit: Capture from MBC and Jo Young Cheol Twitter