Dream Part.02 is the fifth extended play by South Korean boy band Astro.

[1] On October 16, 2017, Fantagio Music announced that Astro will make a comeback with their fifth EP using the name Dream Part.02 on November 1.

[4] On October 23 and 25, they released the album tracklist and preview respectively, revealing "Crazy Sexy Cool" as the title track.

[5][6] Five days later, on October 30, the music video teaser for "Crazy Sexy Cool" was released.

[7] On November 1, they released Dream Part.02 along with the music video for "Crazy Sexy Cool".