Group EXO's member Kai's audition video will be released for the first time.

In SBS special "Hard Working Idols" airing on February 16, the explanation behind the "10,000-hour rule" will be revealed.

EXO Kai, SHINee Taemin, TVXQ Yunho, and other SM Entertainment artists are known to have gone through long years of training before actually debuting. The staff of SBS special decided to find out the '10,000 hours' that these artists put in to be where they are today.

Through this program, Kai's audition video along with Taemin's secret about being tone deaf when he was younger will be revealed.

Photo Credit: SBS