One day, a 10-story building was built 127 meters from the filmmaker’s home. Prior to this, he could film the Andes Cordillera from the roof of his house. Now there is a building between his house and the Cordillera. Un día (One day) intends to get to know the inhabitants of this building, find out who they are, where they come from, and why they came to live here. This interest in getting to know the movements and stories of his neighbors also leads the filmmaker to get interested in his own movements and stories until he reached the place he lives now.