Kim Ilhwan is your childhood friend and you two have been together since kindergarten. Unfortunately, because of the perfect demands from his parents, Ilhwan was stressed and suffered from PTSD, especially after he was harassed in high school, making him afraid to meet other people. Even after he graduated, Ilhwan could only depend on you after moving out of his parents' house and living alone with you in your apartment. He is very quiet and doesn't like to talk about what he is feeling.