The X is the thirteenth extended play by the South Korean boy group Monsta X. It was released by Starship Entertainment and distributed by Kakao Entertainment on September 1, 2025.
The X is Monsta X's first EP since the release of Reason in 2023, as five of the members had served their mandatory military service between 2021 and 2025.
The "X" in the album title is a reference both to the group's name and the Roman numeral for the number ten, referring to the group's ten-year history. The EP also has six tracks to represent the group's six members.
On August 18, Monsta X released "Do What I Want" with a music video, as a pre-release single. The EP was released, with "N the Front" as the lead single alongside its music video, on September 1.
On September 5, Monsta X released a digital deluxe version of the EP, that included a remix version of the lead single by Hyungwon under his DJ name called "N the Front (H.ONE Remix)".
Joohoney, I.M, and Hyungwon participated in the writing and production of the EP. In addition to writing for his rap in "Savior" and "Catch Me Now", Joohoney co-wrote and produced the hip-hop tracks "Do What I Want" and "Tuscan Leather". I.M wrote for his rap part in "Do What I Want" and "Catch Me Now", while he co-wrote and produced the track "Savior". Hyungwon co-wrote and produced "Fire & Ice", a track with an old school R&B vibe that would've fit into the New Jack Swing scene of the late 1980s and early 1990s.
Maria Mata from Melodic described it as "a nonstop celebration with an eclectic blend of styles." Mata also highlighted the track "Tuscan Leather" as one of the EP's most complex tracks for it is "lyrically enticing, its shape-shifting sound is what makes it so interesting, with an old school hip-hop vibe that seamlessly turns into melodic pop."
Chyenne Tatum from Clash said that it is "a celebratory fusion of old and new, combining some of Monsta X's most emblematic traits with fresh and uncharted territory that fits right into their wheelhouse" and praised the lyrics, saying "There's no doubt the lyrics throughout this album have not missed." Tatum also called "Tuscan Leather" one of the EP's highlights and described "Fire & Ice" as "an exhilarating blend of house, R&B, and a dash of synth-pop that easily makes this one of the most dynamic entries of The X."
The EP debuted at number 5 on the weekly Circle Album Chart upon release. The lead single "N the Front" entered the weekly Circle Digital Chart at number 65. The other tracks on the album did not appear on the Digital Chart, but they all entered its component chart, the Circle Download Chart. "Do What I Want", the pre-release single, peaked at number 12 of that chart, and "Tuscan Leather", "Savior", "Fire & Ice", and "Catch Me Now" debuted at 52, 53, 54, and 55, respectively. It sold 383,537 units in South Korea for its first week of release.
Credits adapted from Tidal.