To. X (song)

"To. X" is a song recorded by South Korean singer Taeyeon for her fifth Korean extended play of the same name. It was released as the EP's lead single by SM Entertainment on November 27, 2023.

Background and release
On November 6, 2023, SM Entertainment announced Taeyeon would be releasing her fifth Korean extended play titled ''To. X'' on November 27. On November 24, the music video teaser video was released. The song was released alongside its music video and the extended play on November 27. The remixes of "To. X" by Imlay and Hunjiya, and "Fabulous" by Ginjo, titled ''iScreaM Vol. 30: To. X Remixes'', was released on March 8, 2024.

Composition
"To. X" was written by Kenzie, composed and arranged by Stephen Puth, Dazy, and Kristin Carpenter. Described as a R&B song that "combines sensuous guitar riffs and rhythmic melodies" with lyrics carrying the message of "[Taeyeon singing] about the end of a controlling relationship after realizing that the other person is controlling her". "To. X" was composed in the key of A-flat minor, with a tempo of 97 beats per minute.

Commercial performance
"To. X" debuted at number three on South Korea's Circle Digital Chart in the chart issue dated November 26 – December 2, 2023; on its component charts, the song debuted at number two on the Circle Download Chart, number six on the Circle Streaming Chart, and number 18 on the Circle BGM Chart. It ascended to number three on the Circle Streaming Chart in the following week. It rose to a new peak of number one on the Circle Streaming Chart in the chart issue dated January 21 – January 27, 2024. The song reached number two on the Circle Digital Chart in the chart issue dated December 31, 2023 – January 6, 2024. It was also the best-performing single of January 2024 on the Circle Digital Chart. The song spent a total of 20 consecutive weeks in the top 10 of Circle Digital Chart, surpassed "Weekend" to become Taeyeon's longest-running top-10 hit. On the Billboard South Korea Songs, the song debuted at number six in the chart issue dated December 16, 2023. It ascended to number three on the Billboard South Korea Songs issue dated February 3, 2024.

On the Billboard Vietnam Hot 100, the song debuted at number 93 in the chart issue dated December 9, 2023. In Taiwan, the song debuted at number 22 on the Billboard Taiwan Songs in the chart issue dated December 16, 2023. It ascended to number 19 on the Billboard Taiwan Songs in the chart issue dated March 30, 2024. The song reached a new peak of number 13 on the Billboard Taiwan Songs in the chart issue dated April 13, 2024. Globally, the song debuted at number 187 on the Billboard Global Excl. U.S. in the chart issue dated December 16, 2023. The song reached number 148 on the Billboard Global Excl. U.S. in the chart issue dated January 20, 2024. After moving to number 148, it reached number 103 on the Billboard Global Excl. U.S. on the issue dated February 10, 2024.

Promotion
Prior to the release of ''To. X'', on November 27, 2023, Taeyeon held a live event called "Taeyeon 'To. X' Countdown Live" on YouTube, TikTok, Weverse, and Idol Plus, aimed at introducing the extended play and connecting with her fanbase. On December 8, 2023, a live performance clip of "To. X" was released on her YouTube channel. Taeyeon first performed "To. X" live in front of a total of 100,000 audiences at Tokyo Dome during concerts SM Town Live 2024: SMCU Palace in Tokyo on February 21 and 22, 2024.

Track listing

 * Digital download / streaming – iScreaM Vol. 30: To. X Remixes
 * 1) "To. X" (Imlay remix) – 3:10
 * 2) "To. X" (Hunjiya remix) – 2:32
 * 3) "Fabulous" (Ginjo remix; bonus track) – 4:44
 * 4) "To. X" – 2:50

Credits
Credits adapted from album's liner notes.

Studio

 * SM Starlight Studio – recording, digital editing
 * SM Blue Ocean Studio – mixing
 * 821 Sound – mastering

Personnel

 * SM Entertainment – executive producer
 * Taeyeon – vocals, background vocals
 * Kenzie – lyrics, vocal directing
 * Stephen Puth – composition, arrangement
 * Dazy – composition, arrangement
 * Kristin Carpenter – composition
 * Jeong Yu-ra – recording, digital editing
 * Kim Cheol-sun – mixing
 * Kwon Nam-woo – mastering