A Series of Stories Triggered by a Bottle of Potion

"What is true, tell me what is true." Rosen slowly squatted down, "I am the only one who is kept in the dark about everything." "I'm sorry, I can only say that you are the most critical part of my plan. I can't succeed without you and her." Ji hope said. What is going on? We have to start with the instructions on how to destroy ghosts and be annihilated...