Immune survivor who survives an attack by an infected trainee. She secures an apartment through a contract marriage with detective Jung Yi-hyun. She collaborates with researcher Han Tae-seok, helps establish building quarantine rules, and faces moral dilemmas regarding the infected. Her blood contains antibodies crucial for developing a cure.
Deep emotional bond evolving from friendship to life-defining romance amid the outbreak.
One-sided protective devotion that deepens into mutual romantic commitment.
Hostile power struggle between a pragmatic renter and a self-serving building representative.
Hierarchical conflict where building authority attempts to neutralize independent survival efforts.
Professional collaboration that shifts into a targeted medical interest regarding her immunity.
Clinical objective where Sae Bom becomes the focal point for potential cure development.
Ideological and operational clash between community survival and self-serving control.
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