Shadow's Oath - Chapter 6

Waking up again in his seventh reincarnation, prince Jing Beiyuan found himself back in time, when everything had yet to be set in motion. Having been given a second chance, Beiyuan had to survive court and decide whether it was finally time for him to let go of his feelings; all while trying to handle the youthful, innocent force of nature who had suddenly barged into his already complicated life.

- Description from Novelupdates

At the height of her power, the Supreme Goddess Amane also known as the Beast princess sacrificed herself to save the life of children she had adopted throughout her life. That should have been the end of her story. Amane had achieved her ultimate goal of saving the lives of her loved ones and her sacrifice would give them all decent lives. But the Supreme Goddess felt her eyes opening in a new body and a new era. She had been reincarnated into the body of a Yoko Tsurugi, the mentally-challenged adopted daughter of the Tsuragi family (The family infamous for their beast-taming business) Reincarnated in a new body with no knowledge of why she had been brought back, Amane decided to embrace her new identity and live a carefree and easy-going life doing what she was known for before. She would do what the previous owner of her body was unable to do - Show everyone why you did not mess with her, the supreme tamer of beasts. The new era was different with no ‘alliance’ or distinction between races. The world was a calm place that seemed to have a place for everyone. Amane, now Yoko, should have a decent new life. But the past refuses to let Amane go and the circumstances behind her resurrection were becoming more and more complicated. It was more than clear that something seemed to be brewing in the background of this new era. And the balance of power was not as even as it first appeared to be. Who had called Amane back in her new body? And for what purpose was she brought back? These questions might be more important than they first appear to be.

In 2036, humankind steps foot on Mars for the first time.