what kpop groups disbanded in 2019?
[' Wanna One. Photo: CJ E&M. Best Songs: "Energetic" "Boomerang" "I Promise You (I.P.U.)" ... ', ' PRISTIN. Photo: Pledis Entertainment. Best Songs: "Wee Woo" "Black Widow" "We Like" ... ', ' Nine Muses. Photo: Star Empire Entertainment. Best Songs: "Hurt Locker" "Drama" "Fiagro" ... ', ' Boyfriend.']