Murder is in the air, a mystery's trail is marked with feathers and it's quickly running cold. Cheolmin Han is an office worker who suspects that he's losing his mind...or is he seeing the truth for the very first time? Who are these bird-faced, bloodthirsty creatures he's confronted with? Why are they hunting him? Where do they come from? What do they want? Who will believe him? Most importantly, how will he survive?