Daekwon, the leader of a surveillance unit, is facing the threat of a demotion. His current assignment involves posing as an unemployed family head while he and his team keep a round-the-clock watch on a politician’s family, who have been placed under house arrest upon their return from overseas. The surveillance team, having taken up residence next door under the guise of being neighbors, begins to uncover various secrets. By closely observing and listening to the family’s every move and sound, from requests to a radio program to mysterious noises in the dead of night, they gradually piece together the hidden truths.