On March 4, 2023, Roa was officially revealed as the first member of the group, followed by E. sha on March 5, and Chi. u on March 6.
On March 7, 2023, Nova and Aria were seen in the line-up reveal video of the 44th K-Stage Yes or No concert of which the group would be performing at on March 12, therefore confirming them as members of the group. Later the same day, Nova was officially revealed as the fourth member of the group. On March 8, 2023, Aria was officially revealed as the fifth and final member of the group.
On March 9, 2023, it was announced that the group will release their first pre-debut digital single titled "Who Am I" on March 12. They also shared that they will be making their debut in April 2023. On April 5, 2023, X:IN's official Twitter account revealed the schedule for their debut digital single "Keeping the Fire", which was released on April 11.
On May 17, X:IN announced their official fandom name to be "READY", meaning 'Just as the word action doesn't come out without Ready, it means there's no X:IN without fans, READY'. On June 7, Escrow Entertainment announced that Chi. u had departed from the group due to personal circumstances.
X:IN would continue with four members. On July 8, Escrow Entertainment announced that Roa had left the group and that new members Nizz and Hannah would be added to the group, thus reorganizing X:IN as five members. On August 5, they announced their first mini album Synchronicity, set for release on August 30.
On February 5, the group officially announced that they will be making their comeback on February 25 with the second mini album The Real. On December 5, X:IN announced that they would be releasing the digital singles "Keeping the Fire (2024 Rock Ver. )" and "Acha(%)" on December 12 and 13 respectively.
As of April 9, 2025, X:IN's official website was transferred to BeBy Entertainment, hinting at their change of agency. On April 13, the group announced through a live that they are currently filming the music video for their upcoming comeback in California, United States. On April 22, they announced their third mini album Defend Myself, set for release on May 17, 2025.
On August 6, they announced their first single album "RRRun", later revealed to be released on September 4. On February 7, 2026, they announced their fourth mini album, Hyper, set for release on February 20.
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