Exit (2016)

Theodore is a lonely mathematician who tries to find the exit of his home after the death of his girlfriend. After five years of living in complete isolation inside of his flat he starts to search for an exit. He is scared of the people outside, thinking everyone is the same, as the killer of his girlfriend. That pressures him to find the exit inside of his mind, searching for the right mathematical formula to create a substance that will help him leave and create new worlds there. That's when the real problems started because that imaginative world slowly becomes his reality. He totally lose the sense of what is real and what is imagination.