S01E01Episode 1

The other group members set up a hidden-camera prank to trick Taeyeon. Tiffany, Jessica, Seohyun and Sunny are sent on a mission in the garden of a supposed 'haunted house' and run back screaming, having rehearsed earlier. Taeyeon, Sooyoung, Hyoyeon and Yuri as well as a well-known spiritual expert enter the haunted house, where Yuri proceeds to act as if she is possessed by the ghost of a young child. Taeyeon is made to participate in several rituals that will 'exorcise' the ghost.