Gekitotsu no Hexennacht - Volume 4, Chapter 10: If You Direct the Way

Lingyun, a fierce and savage cultivation genius takes over a dead teenager’s body. Coincidentally, they are both named Lingyun. Set in a alternate version of the 21st century, teenager Lingyun has been killed by someone with a grudge.

In ancient times, there existed giant spirits capable of supporting the heavens. With bodies as enormous as stars, they soared across the universe. Great clan leaders with mysterious blood running through their veins shattered the void and created new worlds. Ancient Qi Warriors crossed a river of stars to enlighten numerous mortal beings. For unknown reasons, an era silently came to an end, all realms were separated, ancient giant spirits disappeared one after another. Thousands of years later, young Nie Tian managed to travel back into ancient times with the help of a drop of blood…

What?! The sticking to her daily, eating her tofu (taking advantage of her ) is a cross-dresser?

Not to mention that he is the Evil Highness!! She had slept beside him, and was touched by him, what a big loss!

Ah–!

Softly on his chest, listening to his pounding, strong heartbeat, her face turned red. Her greatest desire was to be in his arms.

She never dared to dream before, dared not wish for, and thought that in this life there was no such chance. This had been in her most secret heart of hearts, she longed for his warmth, longed for his love.

Even though he had hurt her before, he had given her more tenderness than others.

Being teased, loved, laughed at… had infiltrated into her bloodstream. Love, she did not know when it had taken root, for when she discovered it, it had grown into a towering tree, no longer able to be split open or cut off.

His hug, his warmth, she would not allow him to give it to others. If they were not only for her, she would rather not have them.

- Description from Novelupdates

The most feared Assassin in the world died because of vengeance.