I had a strong Yin spirit since I was a child, so my grandpa helped me to make a living by extending my yang life. It was not until my grandpa passed away that I took over a strange inn. Room 403 that couldn't open the door, the guest who was burned to death, the mysterious female classmate, the friend who was wandering around me... One strange incident followed another, and one mysterious death after another happened around me. How should I choose between changing my destiny against the will of heaven or following the trend?