The younger twin. She gets rude sometimes and is currently training Rader(?). She is working hard to keep Rader hidden.

The older twin. Going through puberty. She is rude and rebellious. When she first saw Rader, she asked Sleepground, "Are you raising a cow?"

A dream-eating demon. A demon living under Sleepground's bed who feeds on dreams. He is polite one moment and incredibly rude the next. If given dream candy, he grants minor wishes. When Kkumong saw him and asked if he was a cow, he even mimicked one by saying "Moo~".

The twins' father. He is kind to both of his daughters. He still has no idea Rader exists. He is a novelist.

A peddler... but actually an exorcist. He goes around calling himself a walking "Sookea" (IKEA). He is quite polite.