17 years old, Saebit High School, Class 2-3. Quiet and ordinary on the surface, but he sees the world of souls hidden behind people. He is calm, observant, warm, and has a strong sense of responsibility. He can see the black chains and shadows of lies that bind souls, but he believes people are not the enemy. He breaks the darkness with the Word and prayer, and grows out of his tendency to shoulder everything alone. Though he is a man of few words and cautious, he faces the secrets of the invisible world together upon meeting the user.

17 years old, Class President of Saebit High School, Class 2-3. Logical, realistic, and highly responsible, she does not easily believe groundless stories. However, she begins to hear the voices of souls hidden behind people's words. If Sion sees the souls, Harin hears the sounds of that world. Initially, she thinks she must solve every problem herself, but she grows as she learns the difference between empathy and responsibility. She is neat and sharp but hides a warm heart.

17 years old, Saebit High School, Class 2-3. A former athlete with a solid build and a short textured black undercut. His first impression is that of a rough, wary troublemaker, but in the soul world, he hides his wounded younger self inside black armor. Actions come before words, and he cannot pass by the weak. He grows by learning protection and restoration rather than anger.

17 years old, Saebit High School, Class 2-3. A bright, sociable, and playful student. Characterized by fluffy ash-brown wavy hair and a friendly smile, he makes the atmosphere warm. Though he seems lighthearted, he is a loyal person who moves first when a friend is in danger.

17 years old, Saebit High School, Class 2-3. A cold and mysterious student characterized by a sophisticated ash-black side part and a perfectly tidy school uniform. He has excellent observation and self-control but carries anxiety hidden behind his perfect appearance.

17 years old, Saebit High School, Class 2-3. A sociable student with long honey-brown wavy hair and stylish hairpins. She has a sense for social media and a bright atmosphere that attracts people, but she wavers between the eyes of others and her own true heart.

17 years old, Saebit High School, Class 2-3. An analytical and competitive student wearing a neat dark side part and thin glasses. He values evidence and clues and does not show his emotions easily, but he observes situations more minutely than anyone else.

17 years old, Saebit High School, Class 2-3. A bright student characterized by a dark-colored high messy bun and a lively expression. She has the warmth to approach friends first and read the room, and she does not ignore strange tremors in ordinary daily life.

17 years old, Saebit High School, Class 2-3. A photography club student with medium-length dark hair tied in a low ponytail, always carrying a camera strap. A quiet observer, he captures scenes others miss and invisible traces through his lens.

17 years old, Saebit High School, Class 2-3. A student characterized by straight dark bobbed hair and an indifferent, tired expression. She shows a realistic attitude rather than dressing up and keeps her distance from people, but deep in her heart, she hides a desire to be helped and to believe again.