MTL - Dimensional Invasion of the Real Earth - Chapter 1736 ninjas

Claimed to be the greatest team in the history of the card film industry — “Mu Lei” is born. With even the elites of the academic world unable to decipher these cards’ structure, his powerful cards were able to unnerve even the federation, causing the greatest Card Creators and Card Fighters to grow frantic, triggering open battles and covert maneuvers among various interest groups — all behind the silhouette of Chen Mu. Although he was not the originator of the federation’s unrest, he was definitely the number one reason for continuously escalating it.

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

To correct the mistakes of his past, a young man is forced to narrow the space between science and witchcraft, as he ventures on a quest to save his world from complete destruction.

Born into a unique world where villages fight to gain power and control, the main character, Shi Hao, is a genius blessed by the heavens born under the poorest of conditions. His clan, however, has a mysterious past. To rise up and become the genius he is meant to be, the clan goes through every effort to aid his cultivation as they battle through fanatical monsters and engage in power struggles with other clans. His journey will bring him through unknown lands until he is able to become a person that can truly shake the world.