Mes amours décomposé(s) 2012 on netflix

A young woman instantly falls in love with her new upstairs neighbor who has a nasty habit of moving bodies in bags in the middle of the night down the stairwell. From time to time, he asks his neighbor for a hand. Or a knife. Or to keep the body for a few days. So much so that she ends up falling as much in love with the last corpse he left on her arms.