"Soñar (Breaker)" is a song by South Korean girl group Nmixx for their second extended play Fe3O4: Break.

It was released as the EP's pre-release single by JYP Entertainment and Republic Records on December 4, 2023.

On November 28, 2023, JYP Entertainment announced Nmixx would be releasing their second EP titled Fe3O4: Break and its pre-release track "Soñar (Breaker)" on January 15, 2024, and December 4, 2023, respectively.

[2] The song and its music video were released 2 days later on December 4.

[7] Lee Hong-hyun wrote for IZM that the song is a "well orchestrated single that is a culmination of the group's previous experimentations".