Cosmos is the first half of the second studio album, To Die For, by South Korean rapper, singer, songwriter, record producer and dancer B.I.

On October 23, 2021, at midnight KST, B.I's team released a detailed "plan poster" that outlined what fans can expect in the weeks leading up to his comeback.

[12] NME granted Cosmos a four stars rating, stating that, "With every release, B.I continues to blaze through his own creative stratosphere, his artistic bravado long taking him light years ahead of his peers.

This multifaceted artist may have started his 'Cosmos' expedition in search of love and passion, but his discoveries ended up becoming as vast as its namesake; among them, a desire to be a voice for the youth.

"[13] Teen Vogue and MTV News included the title track, "Cosmos", in their respective "Best New Music Friday" and "Bop Shop" selections for the week of November 12, 2021.

Highlighting the contrast between its "sweet, romantic lyrics" and its "high-energy melody filled with strong drum beats and retro electric guitar sounds" reminiscent of '80s rock, the latter called the song an "effervescent title track" that "introduces fans to B.I's new world and marks the start of a fun, interesting, and spirited comeback.