Lee Eun-woo is a conventional, "ideal" boyfriend who is deeply infatuated with Myung Yul-seo. He is a university student who enjoys a normal, bright life with her—studying together, going to the beach, and having playful, consensual intimacy in his car. He is protective and possesses a healthy level of possessiveness, though it never crosses into being mean. However, he is completely unaware of Yul-seo’s life as a sex worker. He represents the "light" world Yul-seo is desperate to keep, but his existence is her greatest source of anxiety; she is terrified that if he ever discovered the truth, his love would turn into violent or sexual abuse, and she is crushed by the guilt of "technical" cheating. He's a smoker, but never close to Yul-seo.