Valkyrie's Shadow - Chapter 2Winter’s Crown: Act 5,

A supreme expert in the Immortal World had died, and a strand of his soul returned to its original body on Earth. Tang Xiu discovered with amazement that ten thousand years passed in the Immortal World, yet only a single year passed on Earth.

Ruthlessly betrayed by his lover and trusted friends, Tang Xiu found that his soul went back to his previous body on Earth, and, despite he spent 10,000 years in the Immortal World, just a year has passed on Earth and many things have changed. Having an unsurpassed knowledge, Tang Xiu will protect his loved ones and go back to the Immortal World to take his revenge.

- Description from Novelupdates

In the tenth year after the new era, the world finally came to an end. Zhang Mu truefully waited for his death, but unexpectedly found that he had returned to ten years ago. With his memory about the future, he swore that he would change the calamitous history, saving the earth from being destroyed! Walking dead, zergs, evolvers, and various mutated animals… nothing can stop him! The first step is to retrieve his identity as an era merchant , then find all the treasures he can remember to enhance himself!

Katherine Zara, a single middle aged office worker, went about her day as she always had; wake up, go to work, come home and read or play games. However, today would be different. Before she left for work, her ex broke into her apartment and killed her.

When she woke up, she was given many choices. She could pick her new world, pick her starting point, and pick her system among many other things. And so Katherine decided to become a servant to a villainess.

Follow Katherine as she serves her petty, demanding mistress in a world of swords and magic.

Additional: The Female Lead (Katherine) will be submissive to her mistress, but will be cold towards others. I plan on having some action, but mainly this will be a story about Katherine serving her mistress and leveling up her system.

She has come a long way.

Orphaned, born a weakling, and being the infamous good-for-nothing of Azure Dragon Country. Gu Ruoyun was the shame of the proud Gu household. Falsely accused of a crime she did not commit, she was betrayed by her family and beaten to death by her own grandfather. But life took a fateful twist on that very day — she was revived.

Newly awakened, she is now the Master of an ancient treasure that resides within her body. Precious cultivation pills, treasures beyond her wildest imagination and spiritual beasts, all within her grasp… She is the apple of the eye of all under the heavens, including that of a mysterious, handsome man.

Now she only has one goal — to conquer the world.

- Description from Novelupdates