But they decided to stick to OT5 after Yeri joined
Aug 25th 2021 #2 idk really but iirc back then when they just debuted, there was rumor going around that Red Velvet is just a unit and other units like Blue Velvet, etc will debut too
Aug 25th 2021 #4 I have no idea but I am glad that Red Velvet stayed as a group with 5 members. They perfectly compliment each other this way.