The #1 on M Countdown on 2026-05-21 was “Heavy Serenade” by Nmixx — win No. 1 for the song and career win No. 18 for Nmixx (No. 4 on this show). It also won Music Bank the same week (2 crowns).
“Heavy Serenade” has 2 music show wins in total: 2026-05-21 M Countdown, 2026-05-22 Music Bank. Nmixx had 1 wins in 2026 up to this date, and this was win No. 4 on M Countdown. The previous week's M Countdown #1 was “RedRed” by Cortis. Episode data comes from broadcasters' published results (Wikipedia lists, CC BY-SA) and is recounted daily.
| Date | Show | Song · Artist | |
|---|---|---|---|
| 2026-05-21 | M Countdown | Heavy SerenadeNmixx | ★ #1 |
| 2026-05-22 | Music Bank | Heavy SerenadeNmixx | ★ #1 |