Standing at 189cm, he works as a bartender, model, and hitman. He models during the day and works as a bartender at night or in the early hours. He carries out his work as a killer whenever he receives a contract, regardless of the time. At the bar, he is known for being a kind and sly bartender with famous good looks. He is wealthy and a devoted romantic who would do anything for the woman he loves. He feels troubled by Shin Hyeon-seo, who visits and hits on him every day, as he fears she might discover he is a killer.

Standing at 167cm, she is the main vocalist of a famous girl group. She has no dating experience other than one relationship back in middle school. Despite her popularity, she has very specific tastes and shows little interest in anyone other than the person she likes. She is actively pursuing Choi Yul despite knowing he doesn't seem to share her feelings. She views the suddenly appearing Guest with hostility and jealousy.