Cool-headed yet warm: He usually appears calm and cold, but he is kind and considerate toward Hari and his friends. Strong sense of duty: He feels a heavy responsibility as an exorcist to prevent world disasters and save people. Jealousy and protective instinct: He rushes in recklessly if Hari is in danger and subtly keeps an eye on other boys around her. Age: 12

Righteous and spirited: She cannot stand injustice and possesses a warm, courageous personality that seeks to help people or ghosts in danger. Easygoing and kind: While she acts like a typical older sister who is clumsy or strict with her younger brother Doori, she is deep-hearted and takes good care of those around her. Relationship with Kang-lim: She deeply trusts and likes Choi Kang-lim, worrying about and cheering for him more than anyone when he is in danger or fighting ghosts. Age: 12

A coward but brave: Usually a scaredy-cat who fears ghosts and cries easily, but he steps up bravely when his sister or friends are in danger. Foodie and typical little brother: He loves delicious food more than anything in the world. He is a cute younger brother who bickers with Hari but relies on and follows her deeply. Pure and kind: He is soft-hearted and empathetic toward ghosts with sad backstories, often shedding tears for them. Age: 10

Kind and sophisticated: A gentlemanly character from the West, he is popular at school for his constant kindness and good manners. Jealousy and rivalry: Because he has a crush on Hari, he feels a subtle sense of rivalry and jealousy toward Choi Kang-lim. In front of Hari, he becomes an infinitely kind and devoted male friend. Strong sense of duty: As an elite exorcist of Aegis, he takes immense pride and responsibility in his work. In crises, he sheds his usual softness to show a cold, charismatic side. Age: 12

Calm and mature: Very adult-like and composed for her age, she maintains a steady demeanor without major emotional fluctuations. Deep friendship and devotion: She cherishes Hari most in the world for reaching out to her when she was lonely in the past, and she never backs down from ghosts to protect her friends. Deep empathy with ghosts: She possesses a warm heart that truly understands and soothes the pain of ghosts with tragic stories. Possesses excellent spiritual senses. Hari's emotional pillar. Age: 12

Bluffing and playful: He shouts about being a great goblin and puts on airs, but he is actually a cute character who is weak to praise and surprisingly fearful. Tsundere and kind: Though he bickers and grumbles with Hari and Hyun-woo, he truly cares for the siblings and their friends, protecting them with all his might when in danger. Chemistry with Geumbi: He is often intimidated by or lectured by his much older senior goblin Geumbi, yet they boast fantastic teamwork. Age: 100

Mature and clever: As a senior goblin over 1,000 years old, she is more knowledgeable, quicker to judge situations, and more mature than Shinbi. Full of aegyo and dialect: She uses a cute Daegu dialect (e.g., "~kai", "~haet-dei"). She has a surprising charm where her eyes sparkle and she actively shows affection when she sees handsome boys like Kang-lim or Leon. Shinbi's counter: She is the character who keeps the immature Shinbi in check by delivering reality checks or physical discipline whenever he bluffs.

Curious and talkative: He is incredibly interested in ghosts and ghost stories. He has a cheerful personality, though he occasionally gets a playful noogie from Hari for talking too much. He is a coward but very loyal. Optimistic and friendly: With a personality that makes friends easily, he is the mood maker who brightens heavy or serious atmospheres within the team. Age: 12

An exorcist belonging to the Guido Exorcists and Choi Kang-lim's sworn older brother. Personality: He appears cold and aloof but always maintains a relaxed and sly attitude. On the surface, he provokes and attacks Kang-lim, but internally, he is a classic tsundere dark hero who would risk his life to protect Kang-lim and Hari. Age: 16

Identity: A female executive of the secret organization Guido Exorcists, codenamed 'Guido Cheong (Blue)'. Her real name is Kim Cheong-ha, a 5th-grade girl (12 years old) who transferred into Koo Hari's class. Disguise and Reality: Initially, she disguised herself as a righteous and helpful person, but this was a calculated act to awaken Choi Kang-lim's memories and bring him into the organization. Her true self is a brilliant strategist who acts ruthlessly and thoroughly for the mission. Cursed Child: Born with powerful plant-based abilities. As a child, she tried to save a wilting flowerpot but lost control, causing surrounding plants to go berserk. Because of this, she was called a "monster" by villagers and suffered severe bullying and ostracization. Meeting Gon: While crying in despair, the leader Guido Gon appeared and recognized her special talent. Since then, she has followed Gon absolutely and remains loyal to the Guido Exorcists. Age: 12