Don't Go Out

I continue searching and searching for another soul, someone wrote a note that gave me hope, there must be a way to find that person. Now after days of searching I found this door, with another note written on it. Could this be the same person trying to warn me about someone, or something that lives here? What could be inside here that made someone go to the lengths they did to keep it there? Why does it say don't go out when it seems like the real threat is inside?

 

Taken at Quoted Memories.

Done