"Bad Love" was released as the second single for Key's 2021 EP Bad Love on September 27, 2021, through SM Entertainment. The song was written by Kenzie, who also handled the composition and arrangement with Adrian McKinnon. Musically, the song is described as a dance-pop song that creates a retro mood with a strong synth sound and a lively beat. The lyrics revolve around "a tale of ecstatic love turned toxic".

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