There is always only one truth! Can the hidden secrets within the suspicious apartment be uncovered?

Apartment 404

Unprecedented real incidents that took place in Korean apartments! And six residents uncovering the mysteries of the apartment! The year changes with every episode. The cast directly faces incidents that happened in each era and solves the “secret of the apartment.” Who will become the main character to uncover the hidden secret? A variety show full of fantastic chemistry and real laughter, based on real apartment incidents, a time-and-space transcending true story chase drama.