On Aug. 27, the 11 final winners of Mnet's fan-voted idol competition show "Produce X 101" debuted with the album "Quantum Leap." 

X1 put its career on hold late last year amid growing allegations that the show, the fourth season of the "Produce" series, rigged the result of fans' votes.

The show's director and chief producer were taken into police custody last month on charges of taking bribes worth tens of millions of won from talent agencies in return for fixing the show's vote results in favor of certain members.

The Monday decision came despite a pledge last week from Mnet's operator, CJ ENM, to bring the band back to life.

Officially apologizing over the vote-rigging scandal, CJ said last week it will provide all necessary support for X1 and IZ*ONE, a girl band which debuted through the show's third season, to resume their careers.

Despite X1's disbandment, Mnet will "positively review" the resumption of IZ*ONE's stage career, according to the cable music channel.

The 12-member girl band debuted in February last year through the third season of the audition show. As the third season was also subject to the vote-rigging allegations, the band suspended its career late last year.  (Yonhap)