The Regressed Demon Lord is Kind - Chapter 17

Gu Bailu has transmigrated. She was in Dubai one second ago, but the next thing she knew, she finds herself in a deep, dark forest. To make things worse, her body has been poisoned and s*x is the only antidote. Thinking that she will die in the middle of nowhere, she somehow runs into a handsome guy who’s semi-conscious. Eager to rescue herself, Gu Bailu lies him down, not realizing that he is Prince Zi, a powerful and brutal man who has killed every woman that had approached him. Her life is saved, but she can’t get away from him…

Because her appearance was not breathtaking, the Emperor breaks off their engagement and bestows her instead to the bloodthirsty, ruthless, and cold-blooded Second Prince (Wang Ye).

On her wedding night comes endless humiliation, the genuine Princess Consort becoming a deserted women. A foolish woman before rebirth, she no longer expects his love. In this world, she must possess enough talent to awe those around her, carrying herself with composure and articulating with beautiful diction, override above the nine night.

- Description from Novelupdates

In the year 298 from the era of the gods, elementary school girls Sumi Washio, Sonoko Nogi, and Gin Minowa are tasked with an important mission. They are to become heroes and fight Vertex, a mysterious enemy that is attacking Shinju-sama, the god tree that protects Shikoku, the only area in the world that is still habitable. What they don’t know, is that this fight will cost them more than they could have ever imagined.