Yin-Yang Harmony System - Chapter 2

Reincarnated into the Douluo Continent, inheriting the Emerald Scorpion Martial Soul, with no other options—what should you do if you’re forced to play with poison? Chen Ming declares: “If I’m going to play with poison, I’ll make sure to excel at it. As a transmigrator, even playing with poison, I’ll set an example worth following.”(Anti-Tang San, multiple female leads, no affiliation with the Spirit Hall, self-created divine position.)Raw Title: 斗罗：翡翠毒皇

One day, Luo Jian woke up from his sleep and found himself in a locked chamber where the door and window were all sealed. A note with a few lines written on it was tacked to the wall: “Escape from this room within an hour, otherwise, you will die.”

There is a sequel called Reincarnation Night (轮回之夜) that takes place in the same universe but has different main characters

- Description from Novelupdates

The Imperial Court of Tang Empire became dim and corrupt. The Emperor believed eunuchs. The officials vied with each other for authority. The Tang Empire was about to collapse. The flouring Confucianism, Buddhism and Taoism eyed it covetously. The three sects wanted to contend for the domination of the whole world. Which one would win in the end? Or would they coexist peacefully at last? Armies of different nations invaded the frontier on all sides. People and the whole world were in extreme misery. Who could save them?