The King of the City

I have solved a head-chopping case in Chinatown, where the murderer chopped off the victim's head...
I have solved a murder case in a secret room, there is no exit from the secret room...
I have solved the midnight serial murder case, the murderer committed consecutive crimes and killed more than [-] women...
Interpol, the FBI criminal analysis experts in the United States, are all my defeats!
My name is Lin Chen, 22 years old, a freelancer. Some people call me the god of cars, some call me the king of extremes, and some call me an all-around genius.
However, more people like to call me the king of solving crimes... (This story and characters are purely fictitious, any similarity is purely coincidental, and do not imitate.)