Rebirth 07: Detective, Starting from Clearing the Suspicion

[Heavy suspense reasoning reversal] When he woke up, Detective Superintendent Jiang Xuan was unexpectedly reborn and returned to 2007, only to find a naked and lifeless man lying next to him. "The deceased was found at the bank of the Qingyan River." "There are no obvious man-made injuries on the whole body, and the face is swollen and dark green. It is initially determined that the cause of death is drowning." "No surveillance, no weapon, no footprints, but there is an innocent suspect, a college student." … Faced with a series of suspicions from the police, he must first clear himself of criminal suspicion. The mysterious cases are bizarre and weird, with almost perfect alibi, and unimaginable mysterious motives hidden behind people's hearts. "How do you kill someone silently without leaving any scars?" "The murderer perfectly avoided the surveillance cameras at the time of death. How did you catch him?" "Why was the murderer arrested despite having an alibi even though he was thousands of miles away from the crime scene?" … Jiang Xuan: "I'm sorry, fellow journalists, it's not my duty to explain the case. The arrested real murderer will give me the answer."