The #1 on M Countdown on 2017-12-21 was “Heart Shaker” by Twice — win No. 1 for the song and career win No. 30 for Twice (No. 8 on this show). It also won Music Bank, Show! Music Core, Inkigayo the same week (4 crowns).
“Heart Shaker” has 6 music show wins in total: 2017-12-21 M Countdown, 2017-12-22 Music Bank, 2017-12-23 Show! Music Core, 2017-12-24 Inkigayo, 2018-01-07 Inkigayo, 2018-01-13 Show! Music Core. Twice had 19 wins in 2017 up to this date, and this was win No. 8 on M Countdown. The previous week's M Countdown #1 was “Beautiful” by Wanna One. Episode data comes from broadcasters' published results (Wikipedia lists, CC BY-SA) and is recounted daily.
| Date | Show | Song · Artist | |
|---|---|---|---|
| 2017-12-21 | M Countdown | Heart ShakerTwice | ★ #1 |
| 2017-12-22 | Music Bank | Heart ShakerTwice | ★ #1 |
| 2017-12-23 | Show! Music Core | Heart ShakerTwice | ★ #1 |
| 2017-12-24 | Inkigayo | Heart ShakerTwice | ★ #1 |