Detective in Quicksand

Secret room murder, a couple in two secret rooms; Serial murder, the murderer arrogantly lit fireworks after each crime; The organization pursuing the perfect crime is hidden behind the scenes and will leave a bat handkerchief as a signature at every carefully designed crime scene; A high school student develops from an ordinary person to a well-known detective step by step. It all relies on talent, or there is someone behind the scenes who brings him to the stage; I felt like I was in quicksand, gradually being swallowed up by the outside world...