Apartment 404 (also stylized as Apartment404; Korean: 아파트404) is a South Korean mystery solving variety show based on real life events that took place in housing apartments across different time periods and locations. The cast members are assigned roles, split into teams, participate in mini games and use their detective skills to solve the cases. The show is produced by Jung Chul-min for broadcasting network tvN, who held a successful track record with other programs such as Sixth Sense and Running Man. The first season was aired on Amazon Prime Video from February 23 to April 12, 2024.