The #1 on M Countdown on 2012-01-26 was “This Is War” by MBLAQ — win No. 1 for the song and career win No. 1 for MBLAQ (No. 1 on this show).
“This Is War” has 1 music show wins in total: 2012-01-26 M Countdown. MBLAQ 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 “Lovey-Dovey” by T-ara. Episode data comes from broadcasters' published results (Wikipedia lists, CC BY-SA) and is recounted daily.