"Mmmh" was released on November 30 for digital download and streaming in various countries by SM Entertainment, as the lead single of Kai.
[5] An accompanying dystopian sci-fi themed music video for "Mmmh" was uploaded to SM Entertainment's official YouTube channel, six hours ahead with the single's release.
The visuals end with the singer standing on top of a building with a neon-lit city serving as the background.
[1] Before the official release, Kai held an online press conference with Baekhyun as his MC, where he talked about the song for the first time for the media.
The song debuted at number 26 on the Gaon Digital Chart issue dated November 29 to December 5, 2020.