Cecilia

In the dead of night, a light, incessant pounding interrupts the silent tranquility. With lacking of any reason, Du reaches his home's door, all the while the banging continues without a care in the world.
A glance through the peephole reveals a somewhat small girl, with white hair and yellow eyes, thumping the door with unmatched glee.
She looks like a trick-or-treater, out of season, with her probably-fake fangs and midnight-black robe with popped collar. With expectation, she peers up at the peephole as she knocks on the door with no end in sight.