The thing Lin Yue regretted most in his life was checking out the haunted teaching building in the middle of the night. Thirteen steps, three rules, and a student ghost who is always crying. He escaped with a narrow escape and thought it was over, but it turned out that there was an APP called "Gate of the Abyss" on his phone. From then on, I was either running for my life in the dungeon or on the way to the dungeon. The most damning thing is that his father also entered this game five years ago and has not come out yet.