BT21 ORIGINAL STORY EP.04 – THE UNINVITED GUEST Episode 4 of BT21 Original Story. Release Date: December 21 KST Source Related Pages BT21 ORIGINAL STORY EP.01 – CHIMMY & CHIEF BT21 ORIGINAL STORY EP.02 – COOKY & IAN BT21 ORIGINAL STORY EP.03 – STARRY, STARRY NIGHT Related Pages BT21 ORIGINAL STORY EP.11 – BT21’s PRANK... BT21 ORIGINAL STORY EP.10 – TATA Experiencing... BT21 ORIGINAL STORY EP.09 – YouTube Challenge:...