In the Police Force: Rising Through the Ranks

[Daily Police Life + Decisive Action + Beautiful Women + No Mary Sue + No System + Patriotism]

Having traveled to a parallel world, Lin Yu became a police officer.

On his first day on the job, Lin Yu was ordered to crack down on prostitution. He casually picked up a gangster's wife and discovered that her husband was the head of a new type of drug trafficking case. After interrogating the gangster's wife, Lin Yu cracked a major drug trafficking case and was awarded a first-class merit.

A husband reported his wife missing to the police. The police searched for seven days without success, but Lin Yu's simple suggestion of checking the water meter led to the exposure of the murderer.

...

Just as Lin Yu was rising through the ranks in the police force thanks to his crime-solving skills, his colleagues couldn't hold back anymore. "You lucky detective, you get a first-class merit every day!"