The #1 on M Countdown on 2020-06-25 was “Secret Story of the Swan” by Iz*One — win No. 3 for the song and career win No. 12 for Iz*One (No. 4 on this show). It also won The Show, Show Champion, Music Bank, Show! Music Core, Inkigayo the same week (6 crowns).
“Secret Story of the Swan” has 6 music show wins in total: 2020-06-23 The Show, 2020-06-24 Show Champion, 2020-06-25 M Countdown, 2020-06-26 Music Bank, 2020-06-27 Show! Music Core, 2020-06-28 Inkigayo. Iz*One had 6 wins in 2020 up to this date, and this was win No. 4 on M Countdown. The previous week's M Countdown #1 was “Butterfly” by Cosmic Girls. Episode data comes from broadcasters' published results (Wikipedia lists, CC BY-SA) and is recounted daily.
| Date | Show | Song · Artist | |
|---|---|---|---|
| 2020-06-23 | The Show | Secret Story of the SwanIz*One | ★ #1 |
| 2020-06-24 | Show Champion | Secret Story of the SwanIz*One | ★ #1 |
| 2020-06-25 | M Countdown | Secret Story of the SwanIz*One | ★ #1 |
| 2020-06-26 | Music Bank | Secret Story of the SwanIz*One | ★ #1 |
| 2020-06-27 | Show! Music Core | Secret Story of the SwanIz*One | ★ #1 |
| 2020-06-28 | Inkigayo | Secret Story of the SwanIz*One | ★ #1 |