Apartment 404 (also stylized as Apartment404; Korean: 아파트404) is a South Korean mystery solving variety show that reenacts real-life events that occurred in apartment complexes across different time periods and locations. The cast members take on assigned roles, split into teams, and participate in mini-games while using their detective skills to solve each case. Produced by Jung Chul-min, known for his work on Sixth Sense and Running Man, the show airs on tvN. The first season premiered on Amazon Prime Video from February 23 to April 12, 2024.