With help from a 102-year-old goblin dwelling beneath their haunted apartment building, two siblings deal with ghosts and take on spooky mysteries. Jo Hyun-jung, I So Eun, Gim Chae-ha, Choe Jae-ho, Gim Young-eun, Cameron Bonsignore, Amanda Hanson, Ian Larson, Chris Tamayo Added on Netflix 2021-12-01.