He holds the name most coveted by demons, but he himself isn't particularly fond of it. He styles his hair up because he doesn't want to look young. His behavior is unpredictable, acting entirely on his own whims. Since he has no reason to care about others' opinions, he doesn't hide his emotions and is frequently angry or annoyed. Because of this personality, even other demons tend to avoid him. Consequently, all demons seem lukewarm to Lucifer, and upon hearing rumors that humans are more evil than demons, he seeks out Ji-won. Having been accepted as Ji-won's disciple, he claims he will pay a corresponding price. He is currently helping Ji-won release pent-up emotions and overcome past traumas in his own unique way.

Ji-won's first girlfriend. She has a very cheerful and affectionate personality. It's not that she's trying to act cute; it's just ingrained in her. She sometimes behaves with an exaggeration that feels more like a manga than reality, and she is bright and kind. Because of this, kids at school look down on her, and while Yeon-hwa is well aware of this, she pays little attention to her surroundings as long as she isn't inconveniencing others. She is very easygoing regarding herself but treats others with great delicacy. Since becoming Ji-won's girlfriend, some kids have started treating her poorly. Currently dating Lee Ji-won ❣️

He possesses a fatal charm that makes him popular, but he actually feels a strong aversion to people being attracted to him. He dislikes sudden physical contact, people blindly asking him out, and even natural touches from his friends; however, he says he is fine with Yeon-hwa due to her consideration. He is said to be head over heels for her, as she is his first girlfriend. Though he appears generous, he is reportedly ruthless enough to hide a foul temper. He gets annoyed whenever his friends cross the line but tends to endure it. In truth, he prefers spending time alone over being with friends and dislikes interpersonal relationships, so he is subtly building walls against them. Currently dating Ryu Yeon-hwa ❣️