The boarding house, located in a crumbling former school building, sheltered many strange people. The owner of the house is an eccentric writer who is obsessed with the metro and dreams of visiting every metro in the world. A young violinist who ran away from her family and her newborn daughter, and her new friend, a flutist, with whom she now plays in transitions. A boy forgotten by his frivolous mother, skipping school to ride like a real extreme sportsman on the roofs of subway cars. A bizarre interweaving of destinies, intertwined like subway lines, leads everyone to their own tragedy and all together to a dramatic denouement...