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.[2][3] On January 2, 2024, a short animated film titled Fe3O4: Declaration teasing the release of the EP was released,[4] which is followed by a trailer film titled Sense Break Aware and its accompanying promotional pictures two days later.[5] The track listing was released on January 6, with "Dash" announced as the lead track.[6] On January 9, a performance video for the track "Run for Roses" was released.[7] Two highlight medley videos, an acapella version and a normal version, were released on January 11 and 12 respectively.[8][9]
Composition
Fe3O4: Break consists of seven tracks. The first track and lead single "Dash" was described as having a "Mixx-pop" sound that "crosses between old-school hip-hop with a groovy bassline and pop-punk with a strong sound". The second track "Soñar (Breaker)" was described as being a "mix of Latin-style hip-hop and UK garage". The third track "Run for Roses" is a "country pop song that creates a unique charm by combining unique instruments such as banjo, violin, and electric guitar". The fourth track "Boom" is a "hip-hop song featuring...an intense and heavy 808 bass". The fifth track "Passionfruit" is a "Jersey Club bounce-based pop song". The seventh track "Break The Wall" is a pop song with a "strong synth bass".[10]