MTL - The Full-level Boss is In the Female Respect - Chapter 321 wish

Seven billion humans living on the Earth time-traveled together after they had woken up one morning. They all heard a synthesized female voice.

This story is set during the end of the Sui Dynasty, a time where multiple powers struggled for supremacy and power.

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