K-pop boy group EXO’s comeback single has been leaked online, days before its official release, and the group’s agency is threatening legal action against those responsible.

An audio file of “Overdose,” the title track of the group’s upcoming new album, and a video showing the members practicing the choreography to the song were uploaded on YouTube Thursday, then quickly spread through social media. SM has attempted to retreive all of the videos but has been largely unsuccessful.

In a press statement, SM Entertainment, EXO’s agency, said it will take legal action against those who leaked the footage as well as those who spread it.

“We have requested a police investigation into the leak and will sue, and demand reparation from all those who have illegally posted or spread the footage.”

“Such illegal sharing is a serious case of copyright infringement and criminal activity, and we will take strong measures against it.”

One of the most popular K-pop acts, EXO comprises 12 members who are separated into two subunits EXO-K and EXO-M.

“Overdose,” which will be released in both Korean and Mandarin, is expected to unite all 12 members on stage.

EXO is scheduled to return with the “EXO Comeback Show” at Jamsil Indoor Stadium in Seoul on Tuesday, where “Overdose” and its music video will be unveiled.

The leaked tune is not the completed version of “Overdose,” SM officials said. 

“The leaked video had been filmed for MBC’s music program “Show! Music Core,” and the circulating audio file was extracted from the video,” they said.

The company released a teaser clip of the music video later Friday.

By Sohn Ji-young (jiyoung.sohn@heraldcorp.com)