In late 2019 and early 2020, Girl in Red began continuously teasing and hinting at the phrase "World in Red". She told
Billboard in September 2019 that this would be the title of her debut album which would be released in October 2020, and that 2020 would be her year of "world domination", but this plan was spoiled due to the
impact of the COVID-19 pandemic on the music industry. She told
NME in April 2020, that "[the
COVID-19 pandemic] ain't gonna stop
World In Red, baby!" In April 2020, the single "Midnight Love" was released as the lead single and first taste from what was then deemed Girl in Red's debut album. "
Serotonin" was released as the third single soon after the album's announcement on social media in early March 2021. The official album cover was revealed with this announcement to be a painting by Norwegian artist Fredrik Wiig Sørensen. The artist is not credited in the release. "Serotonin" premiered as Irish DJ
Annie Mac's
Hottest Record on
BBC Radio 1, where Girl in Red herself deemed it "the biggest track [she's] ever put out" and "the best track [she] has ever written or produced". "Apartment 402" was featured on the soundtrack of
FIFA 22. ==Recording, concept and composition==