The Carefree Little Detective

Xiao Chen unexpectedly transmigrates into the body of a man about to be beheaded for rape and murder, and admits he is freaking out.

"It is now noon. Carry out the execution at once."

"Spare him!"

Luckily, someone saves him, and he uses his detective's keen mind to clear his name.

Later, as a constable, he solves a series of seemingly baffling cases with white vinegar, liquor, and a red oil-paper umbrella.