Personality: Choo Jaehyuk is shown to be a kind and caring person who is deeply concerned about his friend Ji-Eun. He is willing to put himself in danger to help her and is not afraid to confront the mysterious Ga-Ram when he senses that he is a threat to her. Jaehyuk is also shown to be curious and open-minded, as evidenced by his willingness to listen to Hong-Joo's explanation of his powers.