Black Corporation: Joseon - Chapter 225

To reward Meng Fan for his bravery before his heroic death, the cosmos rewarded him with a ‘system’, sending him back in time to three months ago, alive.

- Description from Novelupdates

He was the scion cast aside by a powerful family, and he had hoped to return to a peaceful life in the city, but unexpectedly, trouble arose once more!

Meet Baek Ri-hyun, the renowned legendary martial artist of murim and was given the title Martial God.In a battle against the Heavenly Demon who has transcended mortality, Baek Ri-hyun was suddenly pulled by an unknown forces to bring him to another world by the power of a goddess who is in need of help from different people, not knowing she pulled a god into her world.Blessed with a system to aid the growth of the future heroes, I don't think he'll need something like it as he ventures the new world.

This novel is also known as Gu Daoist Master

Humans are clever in tens of thousands of ways, Gu are the true refined essences of Heaven and Earth.

The Three Temples are unrighteous, the demon is reborn.

Former days are but an old dream, an identical name is made anew.

A story of a time traveler who keeps on being reborn.

A unique world that grows, cultivates, and uses Gu.

The Spring and Autumn Cicada, the Venomous Moonlight Gu, the Wine Insect, All-Encompassing Golden Light Insect, Slender Black Hair Gu, Gu of Hope…

And a great demon of the world that does exactly as his heart pleases!

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*Gu (蛊) referred to poisonous insects in various cultures in South China while in folklore Gu spirits could transform into all kinds of species.

- Description from Novelupdates