I Transformed from a Madman into a Mad Detective

Is it difficult to solve the case? Not difficult... Because I can bring myself to be the victim. Am I crazy? Don't know... Because you all think I'm crazy. Am I a detective? Yes... Serial robberies and murders, mysterious deaths of villagers, accidental falling from buildings, mysterious deaths of prisoners in detention centers... There is no case that cannot be solved in my hands. This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.