MTL - Tomb Robbery: Starting From the Classic of Mountains and Seas - Chapter 23

My GPA is lower than a slime’s mana.My name is Atheron il Ataraxia, and I’m the walking disgrace of the Royal Academy of Magic.I’ve been held back twice, my essays are used in class as examples of how not to cast spells, and professors sigh in relief when I don’t blow something up during morning lectures.Truth is? I don’t even like this world.I was summoned. A girl from this world pulled me in like a card from a cursed deck, and now I’m stuck living here. Attending classes, battling evil spirits, and dealing with stuck-up nobles whose names are longer than my backstory.But something’s off. My mana doesn’t behave like theirs. The world listens when I speak. And the whispers I hear at night? They’re getting louder.They say evil spirits wander through Ashgrad under the light of the moon. And I think they’re looking for me.They think I’m a failure.Maybe I am.But if this cursed academy wants to survive the next full moon, they might just have to rely on me — the last-ranked summon with a dangerous secret.

The ending of fairy tales is usually a happy ending of the hero and heroine. As for the supporting characters, who will care about their happiness? Having such a bad thought one day, they suddenly turn dark. They want to revolt, and they don’t want to be the main couple’s stepping stone for their ‘True love’ again. Oh my god! What’s about the plot? What kind of story will it play out with a character like this? Can it still run smoothly? The hero and the heroine are going to be crippled by the supporting character!!!!! Well, there’s actually a project to save the plot from it. By nipping the bud of all evil thoughts from them, and let the hero and heroine live together in happiness. The named of this project is ‘To save the supporting character’. All executors must dutifully do their work, and as for the mean to achieve it? Oh! That’s not worth mentioning~

No matter whether it is a white cat or black cat, if that cat can catch a mouse then it is a good cat.

- Description from Novelupdates

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

The Republic of San Magnolia.