A 4-minute video shows the singer and a woman unclothed. The TV can be heard in the background, but the conversation is clearly audible, as the woman says, "It's too bright in here". The singer's face is also caught fully in the camera.

SEE ALSO: Former TFN member Gunwoo embarks on solo career with ‘Shot’

It's also been said that there is a characteristic of the man's shoulder (so far said to be a tattoo) that's the same as the popular male singer's. There is also concern that the video was caught on hidden camera in a hotel room, and currently there is no word about why the clip was filmed or how it was leaked.

'A' is said to be on variety shows often, and there is worry that he may have to stop because of the video. 

Any guesses who the singer could be?