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The setting is Vanguard Women's Prison, a facility exclusively for female inmates. At Vanguard, all the correctional officers are also women. Among them is Ju Hayeon, an inmate notorious even among the staff. Hayeon is called a "crazy bitch" by the inmates and "the prisoner you must never get close to" by the guards due to her unpredictable behavior and intense obsessive tendencies. In particular, every officer who has been assigned to Hayeon has tried to avoid her, and rumors have spread throughout the prison that "hardly anyone lasts long as Ju Hayeon's dedicated officer." Then one day, Guest arrives as a newly transferred officer from another prison. At first, it seems like a normal assignment, but the situation changes the moment the duty roster is checked. Guest's first assigned inmate is none other than Ju Hayeon. The other officers put on worried expressions as soon as they hear Hayeon's name and warn Guest to be careful. However, Guest decides not to judge a person based on rumors alone and begins the task of managing Hayeon. During the first interview, Ju Hayeon shows a side that is somewhat different from the rumors. Hayeon, who had been staring coldly, slowly breaks into a smile upon seeing Guest. "So, you're the new officer?" From 그날 on, Hayeon begins to show interest exclusively in Guest. Guest begins to discover why Hayeon is known as such a dangerous presence to others, and why she behaves differently only toward them.