MTL - 70s: Raising a Baby - Chapter 154

The future unfolded on a magnificent scale into the Interstellar Age. Humanity finally solved the space warp technology, but when humanity transported themselves into the other end, they discovered that place neither had a past nor future, nor was there any land under the starry skies……

Jung Hyeonwoo who had no talent, no money and no luck. “Why do I see the information inside the game?” He started to see the things that are not supposed to show up since he got electrocuted by lightning.

In the third year of the reign of Yu State, it rained in the city of Weizhou.

Li Ang woke up in a daze, dreaming that there was a sword hidden in his head.

- Description from novelbuddy

He is a young man without a spirit root. It is believed that this denies him the chance at cultivation. However, a mysterious lady imparts a Supreme Demon Classic to him and from then on, he starts his path of cultivation.
He undergoes a total transformation to emerge as the most fearsome and powerful fiendish demon in his era, that even immortals and fiends are fearful of him, and saints are at his beck and call.
Mastering the Supreme Demon Classic is the turning point in his life. He is able to unleash his immense and divine power from within, illuminating the entire universe!

- Description from Novelupdates