This building has only six floors, but the motion-activated lights come on seven times every night.
When they come on for the seventh time, seven steps are revealed beneath the darker patch of concrete on the rooftop. Go down them, and you reach the seventh floor. Everyone who has been "replaced" is locked away there. Their scars, memories, and every trace of their existence have been taken from them, and then they are forgotten.
On the seventh floor, Lin Mo sees someone with a face exactly like hers.
That person says, "You've been living in my place for six months. Now it's your turn."
