The Case of the Mysterious Jigsaw Puzzle

Intro: Why are headless corpses inserted into cement surfaces? Is it to assert dominance? For revenge? Or a warning? Why does a runner, naked, suddenly explode to death? Is it self-immolation? Or a bomb? Where did the bomb come from? In a sealed ward, how does a suspect, handcuffed, commit suicide by hanging? What exactly did the man who fell to his death on the rooftop from a high altitude experience? A murder video, initially dismissed as a joke, actually happens a week later; who directed this deathly transmigration? Murders of passion occurring simultaneously in the south and north of a city thirty kilometers apart, with the killer being the same person? Who did he truly kill, and whom did he spare? Is that enough? No! There's also the car that vanished from the bridge, the dog that moved from the rooftop to the ground floor, and the perverted killer treating the crime scene as a murder scene... Behind every suspicious case, who is meticulously orchestrating everything? How are these "high-IQ" individuals, who commit crimes for the sake of crime, exposed by a mere reporter, piecing together the truth of evil like a jigsaw puzzle!