The #1 on M Countdown on 2012-09-27 was “Crayon” by G-Dragon — win No. 1 for the song and career win No. 1 for G-Dragon (No. 1 on this show).
“Crayon” has 1 music show wins in total: 2012-09-27 M Countdown. G-Dragon had 1 wins in 2012 up to this date, and this was the artist's first win on M Countdown. The previous week's M Countdown #1 was “I Wish” by F.T. Island. Episode data comes from broadcasters' published results (Wikipedia lists, CC BY-SA) and is recounted daily.