MTL - Great Xuanwu Sheng - Chapter 8 kill

The thousand-year-old Imperium is crumbling, and war looms on the horizon, bringing with it both brutalities and splendor. Caught in the midst of this chaos is Lansius, an office grunt and veteran MMO player who has been transformed into a medieval peasant. With no wealth, status, or magical abilities, and armed only with his basic knowledge of the art of war, can he endure and thrive in this realistic medieval fantasy realm?Follow Lansius as he moves from one occupation to another, striving to survive during these turbulent times.

A con-man and policewoman that are legends of their respective professions suddenly die, then are reincarnated and return to the Tang Dynasty of ancient China as little kids.

Accepting their second chance and forced restart, they choose to use the modern knowledge and specific talents that they have in their previous lives in order to live comfortably in this new life.

- Description from Novelupdates

“As a firearms modifier, it’s normal for me to have better marksmanship, right? John Wick?” —— “The John Wick Series”

“As a private detective, it’s weird to solve the case faster than you, and better than you can fight? Zhou Xingxing?” – “Play Back To School”

“As a psychiatrist, shouldn’t the patients in Arkham Asylum listen to me? Bruce?” – “Batman”

“As an archaeological expert, a little knowledge of Feng Shui and tomb chambers, isn’t this a basic professional quality? Wu Tianzhen?” – “Tomb Raider Series”

“As an animal breeder, is it too much to keep some Godzilla and King Kong?” – “Monster Series”

 …

One world, one profession, let ordinary professions glow with new brilliance in the heavens.

- Description from novelbuddy

The notorious firearms crime lord Chen Zhang An a.k.a Old Fox was placed under house arrest by the very successor he groomed.