옆집소녀 (Girls Next Door) is a group formed by the program "Idol Drama Operation Team". The group consists of seven members from different companies: MAMAMOO's Moonbyul, Red Velvet's Seulgi, I.O.I'S Somi, Lovelyz's Sujeong, SONAMOO's D.ana, Kim So-hee, and OH MY GIRL's YooA.