[3] Two days later, it was revealed that Winner's comeback would consist of a single album that would be released online on December 19.

[7] The group held an hour-long comeback special live "Merry Millions Day" on Naver's V App on December 19 at 5 PM (KST).

[11] Tamar Herman of Billboard describes "Millions" as a "feel-good dance track that brings a summery feel" and that is "fronted by plucky strings, snappy drum beats, and bright whistle synth effects.

"[12] Woo Jae-yeon of Yonhap News Agency defines it as "a tropical-pop dance song.

[14] They promoted the song on several music programs in South Korea, including Inkigayo.