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.
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".
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.
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.