The #1 on M Countdown on 2016-12-15 was “Boom Boom” by Seventeen — win No. 1 for the song and career win No. 2 for Seventeen (No. 1 on this show). It also won Music Bank the same week (2 crowns).
“Boom Boom” has 3 music show wins in total: 2016-12-15 M Countdown, 2016-12-16 Music Bank, 2016-12-21 Show Champion. Seventeen had 2 wins in 2016 up to this date, and this was the artist's first win on M Countdown. The previous week's M Countdown #1 was “TT” by Twice. The other shows that week went to The Show: “Boom Boom” by —; Show Champion: “A Lie” by B1A4; Inkigayo: “Star” by Heize. Episode data comes from broadcasters' published results (Wikipedia lists, CC BY-SA) and is recounted daily.
| Date | Show | Song · Artist | |
|---|---|---|---|
| 2016-12-13 | The Show | Boom Boom— | ★ #1 |
| 2016-12-14 | Show Champion | A LieB1A4 | ★ #1 |
| 2016-12-15 | M Countdown | Boom BoomSeventeen | ★ #1 |
| 2016-12-16 | Music Bank | Boom BoomSeventeen | ★ #1 |
| 2016-12-18 | Inkigayo | StarHeize | ★ #1 |