X:IN (엑신) is a five-member K-pop girl group under BeBy Entertainment. The group originally formed by Escrow Entertainment. The group has five members: E.sha, Nizz, Nova, Hannah and Aria.

They made their debut on April 11th, 2023, with the digital single “KEEPING THE FIRE”.

On June 7th, 2023, Escrow Entertainment announced that Chi.u had left the group due to personal circumstances. A month later, on July 8th, 2023, 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.

In August 2023, the group released their first mini-album SYNCHORNICITY and were met with favorable reviews from fans and critics. In 2024, the group returned with their second mini-album, THE REAL. The album featured the song “MY IDOL”, which went viral for being an homage and name-dropping several senior K-Pop acts.

On April 9th, 2025, X:IN moved to BeBy Entertainment. After moving to a new agency, X:IN announced their comeback a year after the release of their second mini-album. On May 17, 2025, the group released their third mini-album Defend Myself, with the title track “Attention Seeker”.

On August 6th, X:IN announced their first single album RRRUN, which was released on September 4th, 2025.

On February 7, 2026, they announced their fourth mini album, Hyper, set for release on February 20.