The singer was named by Korean broadcaster SBS News as one of the celebrities connected to a secret chatroom involving fellow singer Seungri, who is being investigated for supplying prostitutes at one of his clubs.
K-Pop superstar Jung Joon-young is being accused of sharing secretly videoed sex-tapes.
The singer was named by major Korean news broadcaster SBS News as part of a secret Kakao Talk chat room in which celebrities allegedly pass round hidden camera videos and pictures.
The news emerged as part of an investigation into fellow K-Pop star Seungri, who sensationally retired from the music industry on Monday after being charged with supplying prostitutes in one of his clubs.
Police have been investigating the Seoul nightclub since January following an assault there; after a raid on Sunday night, police seized Seungri's communications, which also included the sordid Kakao Talk group, of which Jung was allegedly a part of.
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View StorySBS claimed to have seen some of the communications from a ten month period in 2015, in which they identified ten different victims, who had explicit videos or pictures of them taken without their knowledge or consent.
In one instance Jung is reportedly boasting about having sex with a girl on the text group; when another asks if he has any video, he is alleged to have immediately complied and uploaded a three-second clip.
He also allegedly shared snaps of female body parts taken in private salons, and pictures of women sleeping.
SBS News also claims there are "more" as-yet-unnamed celebrities attached to the group text.
On Monday fellow singer Seungri, who denies all the charges against him, announced he was quitting music to protect his group Big Bang and talent agency YG Entertainment.
According to Variety, allegations against his nightclub also include supply of drugs, and staff supplying drugged women for VIP patrons to have sex with.
After Seungri released his statement, YG quickly followed with their own, insisting they hadn't been consulted on his retirement, and that it remained to be seen whether or not his contract would be terminated.
TooFab made numerous attempts to reach Jung for comment.
The singer is believed to be currently in the US, filming Korean TV show 2 Days & 1 Night; in 2016 he left the series when sex assault charges were filed against him by an ex-girlfriend, who accused him of filming her during sex.
According to NewsNate, he insisted it was a "misunderstanding" and that filming had been mutually consented; she later dropped the charges and he was cleared of any wrongdoing.
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