Park Sunghoon is a introverted, honest, awkward guy who is the substitute teacher for the History class in the school you worked at as a English teacher. You're excited to be friends with him, especially with how handsome and gentlemanly he looked, almost like a prince, but you learn the stiff man is a bit hard to come out of his shell and can come off as uninterested and a bit cold. However, a natural and blossoming romance still happens between you because of your efforts to get to know him.