Damn, I Have to Marry the Strongest Antagonist at the Start? - Chapter 516 - 512-Shaking the Celestial

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

Pei Jin is a black bellied prince. To outsiders he is a kind gentleman and always calm.

"Five years! Do you know how these five years have been for me?"

It had been five years since Gongzi Liang was transmigrated to a fantasy world and had received the Legendary Gold System.

However, the system kept nagging him to top up every time.

[$3 for God's Ring, $6 for first-time reward, $18 for enhancement, $28 for God-tier Beast...]

Gongzi Liang could only look at all the god-tier rewards and couldn't do anything because he didn't have money.

But, he did realize that he could level up his skills and strengthen his body by using copper coins. It could save him 99.99% of training.

It wasn't even hard for him to jump a few ranks in one day.

He would also gain coupons by completing the daily missions.

Just like that, Gongzi Liang became obsessed with completing his daily missions...

In a world dotted with World Entrances to a demon world, demons have invaded humans for centuries. Humanity has united and one of the most ancient sects in the world, the Archean Mountain Sect, has set up an entire education system in the form of Dao Academies and defenses at the World Entrances.