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Mayday is the third single album by South Korean girl group April. It was their second comeback in 2017, after releasing their third mini album Prelude in January.

On 7 March 2017, it was reported that April had recently started filming a new Mnet reality program set to be broadcast in April 2017. It was also reported that the group is also preparing for a mid-April comeback with plan for the new album to be promoted along with the new show.^{[1][unreliable source?]} On 14 March, it was confirmed that the reality program titled "A-IF-Ril" would start airing on 4 April for a total of five episodes.^{[2][unreliable source?][3][unreliable source?]}

On 4 April, the group released the surprise tennis court themed MV for their single "Sting" (Korean: 따끔), through the first episode of their reality program "A-IF-Ril".^{[4][unreliable source?]}

On 12 April, DSP Media announced that the group's comeback would be postponed until after finishing the filming of their reality program "A-IF-Ril" – the new release goal was set for mid-May.^{[5][unreliable source?]}

On 8 May, the group started their second reality program of the year, titled "April Secret" on Naver TV.^[6]

On 15 May, DSP Media announced that the group's comeback was set for 29 May with their second single album titled Mayday.^{[7][unreliable source?]} On 29 May, the tennis court themed MV for their single "Sting" (Korean: 따끔) was re-released under the title "Lovesick",^[8] together with the single's title track "Mayday" and its retro themed MV,^[9] followed by a special choreography MV of "Mayday", on 1 June.^[10] On June 22, April performed a special stage of "Sting/Lovesick" on Mnet's M Countdown.^[11]