Fe3O4: Break

Fe3O4: Break is the second extended play by South Korean girl group Nmixx. It was released by JYP Entertainment and Republic Records on January 15, 2024, and contains seven tracks, including the pre-release single "Soñar (Breaker)" and the lead single "Dash".

Background and release
On November 28, 2023, JYP Entertainment announced Nmixx would be releasing their second EP titled A Fe3O4: Break and its pre-release track "Soñar (Breaker)" on January 15, 2024, and December 4, 2023, respectively. On January 2, 2024, a short animated film titled Fe3O4: Declaration teasing the release of the EP was released, which is followed by a trailer film titled Sense Break Aware and its accompanying promotional pictures two days later. The track listing was released on January 6, with "Dash" announced as the lead track. On January 9, a performance video for the track "Run for Roses" was released. Two highlight medley videos, an acapella version and a normal version, were released on January 11 and 12 respectively.