In DC/Young Justice with the Omnitrix/Ultimatrix and a Chat Group - Chapter 20: Dissatisfaction

Bai Aoxue, the best mercenary in the 21st century, is accidentally sent back to the Chengxi Dynasty in Great Continent due to an explosion in her mission, and trapped in the first daughter of Prime Minister. After her rebirth, she is set up by her father to marry the 5th prince Jun Yeyan who wears a mask all day long.
In the face of bloodthirsty enemies, discord between brothers, collusion among courtiers and invasion of enemy state, can Bai and Jun resolve the crises? What will happen to their political marriage? How will the fierce battle for the throne end?
With many twists and turns, the book brings you to experience palace revolution, love and hatred thousands of years ago.

- Description from Novelupdates

Alexander was the greatest tyrant in history. His cruel, brutal and vicious reign struck fear in his enemies and allies alike. But that all ended when he was betrayed by his own people and beheaded by his archrival. As Alexander’s consciousness faded away all he could think of is all the faults he made, how he could have avoided them, how unlucky he had been, and his wrath and unwillingness to die at the hands of the man he hated most! But unexpectedly he was given not only the answers to these questions, but also a second chance to right all his many wrongs.

“Before the towers fell, before everything was consumed by darkness...”Leo Astralis whispered to himself while traversing through the rubble of the ancient structure.His body bore the scars of survival, bite marks that throbbed against the coarse, blood-stiffened fabric of his clothing.“..I wonder what the world was like.”After humanity failed to complete the Tower almost 700 years ago in time, it exploded, spreading monsters all over the word.Even the system, which blessed humans with power, had abandoned them. Or did it?[Run]A singular message urged Leo to escape, yet it was short lived as was he was caught like an animal in a trap.And just like an animal he lashed out until the very end, taking one of the captors to the grave with him.But as darkness closed in, the system spoke again.[One time Regression activated][Congratulations. You've activated the Heart of the System]

In the dream, Yi Meng will incarnate various non-human beings in the beautiful heavens.

Justice League, the first Doomsday head of Superman’s Kryptonian homeworld. Marvel Universe, Artificial Intelligence of Iron Man’s Daughter. Harry Potter, The Sword of Gryffindor at Hogwarts.

…

When the people of the motherland came to reality, they looked up to the sky and laughed maniacally, trying to become the gods of all mankind.

Yi Meng decided not to pretend.

“People from the motherland invaded the real world? Fortunately, I am the Doomsday Superman!”

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There are already two premium Marvel fanbooks with a high order of over 20,000—[My Marvel Superman Girlfriend] and [I Draw Unlimited Cards in Marvel], quality assurance!

- Description from novelbuddy