BT21 BABY Peekaboo Monitor Doll BT21 BABY Peekaboo Monitor Doll will be released on August 31, 2021. Release Date: August 31, 2021 KST LINE FRIENDS Korea LINE FRIENDS Collection Global Source Source Related Pages BT21 BABY Prism Digital Case BT21 Tamagotchi BT21 BABY Portable Pouch