April (에이프릴) KOREAN APRIL – YES SIR YES SIR 2nd Single Album `MAYDAY` 2017.5.29 Chaekyung, Chaewon, Naeun, Yena, Rachel, Jinsol Lyrics/작사: 어벤전승, 정재엽 Composer/작곡: 어벤전승, 정재엽 Arranger/편곡:…