For the Glory of Rome: Chronicles of an Isekai'd Legion - Chapter 17B3 : The Waiting Game

A bored teenager, after praying to god for something to relieve his boredom, got his prayers answered. It just so happens that Systema Kami, the God Of Worldly Systems, was recruiting an assistant!-Ding![System Creator System has been integrated into the host’s soul!][First Task: Create a soul parasite type system.][Second Task: Grant the system to any living being.][Third Task:…]After receiving the System Creator System, Keith embarked on a journey to becoming the greatest System Creator!Training System, Leveling System, Hero System, Villain System, and even Harem System! The possibilities are endless!When he received the system, some of the secrets of his world were revealed to him!Keith McDowell: System, are you serious? There is a book titled “End Note” that has the power to bring the end of anything. And it just so happens that a regressor obtained it which should have been mine?[Yes.]Keith McDowell: And my schoolmates have been summoned to another world as heroes to defeat the demon lord and save the world?[The creator is right. Not only that, there will be a dimensional gate that will open after a month.]Keith McDowell: Finally! My thirst for entertainment can be satiated!In other words, this is none other than the journey of a young man who wants to entertain himself, whatever it takes!

A decision can destroy the sun, moon and stars. A finger can kill the Heavenly Overlord. While chatting, the Heaven and ten worlds can be annihilated.

A poor little kid walks out from a remote mountain area while holding the Nine Dragons and the Incredible Cauldron. With a control over the time and space eternally, he embarks on the Path to God where he defies the odds of the boundless universe gaudily by fighting against royalty and clashing with the legendary generation.

- Description from Novelupdates

In childhood, they were neighbors. Xie Zhen always bullied Li Yu.

Who told him to be as beautiful as a girl?

After parting for many years, they met again in the capital. With a tall stature and heroic bearing, he seemed like a completely different person.

Not only that, but his identity had also risen to that of the sixth prince.

Hearing he wanted to marry her, Xie Zhen was almost scared silly:

Σ(っ °Д °;)っ What’s his intention? Taking revenge on her?

- Description from Novelupdates