The #1 on M Countdown on 2015-10-15 was “I” by Taeyeon — win No. 2 for the song and career win No. 2 for Taeyeon (No. 1 on this show). It also won Show Champion, Music Bank, Inkigayo the same week (4 crowns).
“I” has 6 music show wins in total: 2015-10-14 Show Champion, 2015-10-15 M Countdown, 2015-10-16 Music Bank, 2015-10-18 Inkigayo, 2015-10-24 Show! Music Core, 2015-11-22 Inkigayo. Taeyeon had 2 wins in 2015 up to this date, and this was the artist's first win on M Countdown. The previous week's M Countdown #1 was “Rhythm Ta” by iKon. Episode data comes from broadcasters' published results (Wikipedia lists, CC BY-SA) and is recounted daily.
| Date | Show | Song · Artist | |
|---|---|---|---|
| 2015-10-14 | Show Champion | ITaeyeon | ★ #1 |
| 2015-10-15 | M Countdown | ITaeyeon | ★ #1 |
| 2015-10-16 | Music Bank | ITaeyeon | ★ #1 |
| 2015-10-18 | Inkigayo | ITaeyeon | ★ #1 |