Red velvet does not make the bubblegum pop type. The Bubblegum pop genre sounds very childish to me as well. The ear needs to get used to the childish way of speaking. Red Velvet has the closest this type Rookie but they mostly sing mature way. Red song is Electro pop and experimental style. Dumb Dumb is a quirky, creepy, crazy concept. Charlie's chocolate factory concept. Not the Lolita concept. Also, they sing normally, they don't make a sweet girl voice in the songs. RV; sing Rnb style.