Ghost Brain Part 1

Heavy snow closed the mountains, and Douzhuang Castle became an isolated island. A wealthy businessman died mysteriously in a secret room, and no trace was found at the scene. Detective Shu Yi was invited into the game, but found that every guest had a perfect alibi, everyone was like a friend, and everyone was suspicious. When the clues are peeled away, the truth is closely connected with the old case many years ago - this is not an isolated murder, but a well-planned... Can Shu Yi solve the mystery of this old castle in the midst of people's confusion?