Bomi sees her brother Wonho changing.  He isn't the same anymore. Always on edge and always on the lookout.  Wonho told her to never open the door, but she did.  Bomi finds out why her beloved brother was so uptight. 

They didn’t know I could see them, they were completely unaware. They would never expect it, not from me and that made the outbreaks come as a shock. They acted like the world is theirs while this clearly isn’t, not on my terms. ~