Neowaui Choehumaneul

Kang Han-Gil, a delivery man, struggles to heal his father, who has become a zombie. Weary of poverty, Shin Mi-Dae, a former enemy of his, appears before him, claiming to be a "zombie therapist." Using the "new medicine" that will cure his father as bait, Mi-Dae demands Han-Gil sleep with him. Then, when his father escapes, the apartment becomes a zombie den, and Han-Gil and Mi-Dae are left stranded. With their own agendas, can Mi-Dae and Han-Gil survive this hellish apartment?

(Source: Bomtoon, translated)