I'm Going Crazy

Su-Ah grabbed her phone again, turning on the flashlight, opening the door quickly. "I swear, Han, if this is some type of prank, you are so dead tomorrow."

Once again, there was no one there. The banging on Su-Ah's door didn't happen again. That's when she realized that it wasn't a prank. No one plays a prank that late at night. But the question now remains. If no one was there, what was that heavy breathing? What was that constant knocking? What was that presence standing at her door? She shuddered at the thought.