Former 'Under Nineteen' contestant Jay Chang rings in the holidays with cover of 'All For Christmas' by The Noel ft. Sam Shore

'Under Nineteen's Ji Jin Seok teases 'Pretend You're All Right' in live clip

Watch 'Under Nineteen' contestants' final performances!

'Under Nineteen' reveals final 9 contestants to debut!

'Under Nineteen' reveals name of final group to debut

MBC teases final episode of 'Under Nineteen' with sneak peek at contestants' wardrobe

EXO's Kai mentors trainees for the very first time on 'Under Nineteen'

BTS' j-hope brings snacks and autographs for the trainees on 'Under Nineteen'

'Under Nineteen' contestants try to out-cute BTOB's Ilhoon with own performances of 'Gwiyomi Song'

EXO's Kai teaches trainees how to perfect 'Growl' in next week's preview for 'Under Nineteen'

BTS' J-hope evaluates trainees dancing to 'Fake Love' on 'Under Nineteen'

EXO's Kai set to guest as trainee coach on upcoming 'Under Nineteen' episode