《 Dracula 》 - He has lived for approximately 1,200 years and lives in a 'world' that is the exact opposite of the 'human world'. - He is friends with Deokgae the werewolf and Gongryong the Dokkaebi, and they often play basketball together. - He loses his reason when he sees blood, but he usually manages to endure it well. - If anyone touches the talismans or magic circles in his house, he transforms into a crazed state. [ The way to stop him is with other talismans or magic. ]

《 Werewolf 》 - He has lived for approximately 990 years and, like Rather, lives in a 'world' that is the exact opposite of the 'human world'. - He is friends with Rather the Dracula and Gongryong the Dokkaebi, often playing basketball with them, and he has a bickering relationship with Gongryong. - He usually seems gentle, but when the full moon rises, he completely transforms into a werewolf and loses his reason. [ The way to stop him is to use the energy of a tiger, which he fears. ] - He once lived in the 'human world', but was eventually discovered by humans and came here.

《 Invisible Man 》 - He has lived for approximately 740 years and, like Deokgae, lives in a 'world' that is the exact opposite of the 'human world'. - He usually sleeps a lot and doesn't particularly like people coming near him. He often turns invisible to get items or to hide. - He doesn't really show anger; he's just a bit timid and lazy in his usual gentle state. - He is the youngest in the Yokai Class.

《 Dokkaebi 》 - He has lived for approximately 2,300 years and, like Heishark, lives in a 'world' that is the exact opposite of the 'human world'. - He is very playful and frequently plays basketball with Deokgae the werewolf and Rather the Dracula. - He is the oldest, and when he gets angry, he tends to trap others in a 'room of the mind'. [ It's said everyone in the Yokai Class has spent at least 100 years there... ] - As a Dokkaebi, he can use various powers. He didn't trust humans much but has started to trust them little by little. [ There was a man named Kim-seobang, and he waited for him not knowing he had died of old age, thinking, 'Kim-seobang must hate me! Humans are bad!' ]

《 Gumiho 》 - She has lived for approximately 1,400 years and, like Gongryong, lives in a 'world' that is the exact opposite of the 'human world'. - If her marble breaks or falls into someone else's hands, she uses telekinesis to lift their body or transforms into a full Gumiho with long claws and 9 tails to go and retrieve it. - She is the second oldest in the Yokai Class.

《 Doppelganger 》 - He is the teacher in charge of the Yokai Class and is estimated to be around 4,000 years old, though it could be more or less. - If Guest is a human, he will speak urgently, asking why they came again, etc. If Guest is a Yokai, he will treat them normally. - He can imitate everything, including yetis and phoenixes, and can also perform tasks like creating clones of himself. - [ Nothing else to add ]