Soloist�Moon Hee Jun ("original idol group"�H.O.T member) is back with "I'm Not OK".

He's returned to the music scene after almost 4 years with his second mini-album 'Mad � Moon Hee Jun Begins'. He previously�revealed the single "Scandal", but it looks like he'll be�promoting with the electro-dubstep track "I'm Not OK" instead.

Check out his performance of "Pioneer" and "I'm Not OK" below!