Death March kara Hajimaru Isekai Kyusoukyoku (WN) - Book 1 - 1-2. Written Dream Read as Ephemeral

An ordinary young man on earth, Xia Feng, traveled to a world of sword and magic, and took the body of Lucien Evans, another ordinary young man.

She is the Crown Prince’s fiancee, but on the night of their wedding, an edict was made and she was given off to marry the crippled and paralyzed God of War.

On their wedding night, the paralyzed groom pressed her under his body: “Do you want this prince to kill you or poison you?” Lin Chujiu is a famous surgeon so she wouldn’t feel threatened that easily. She turned and pressed the crippled man under her body: “Say, do you want me to completely waste your legs or waste your third leg?”

She is a genius surgeon doctor in Modern Era that was transmigrated into the body of the Eldest Miss of Lin Family.

He is a famous prince that named as the God of War and was feared by many.

“I, Lin Chujiu, am not a good woman. I do not know how to write melodramatic words.”

“I am in love with you and willing to do anything for you. I will bear the blame of our country or even help you seize the vast territory of our motherland…”

“I hate you, I am willing to pull out your heart, take out your bones and after you lose your life I will destroy this picturesque country…”

- Description from Novelupdates

A calculating merchant of noble birth lives a comfortable life managing his guild's business at the Imperial Academy—until lightning strikes him, leaving him with prophetic visions of a disastrous future. In these visions, he's expelled from his family, branded a traitor who aids demons, and worst of all, becomes a penniless beggar. When the supposed “protagonist” of these prophecies enrolls at the academy, he realizes his countdown to ruin has begun. Now he must use his foresight to rewrite a story where he's cast as a third-rate villain, all while navigating ancient dungeons, demonic threats, and the troublesome “hero” who might be the key to changing his fate.#MoneyIsEverything

Suddenly a high school student Subaru Natsuki has been summoned to another world on the way back from the convenience store. With the biggest crisis of his life being summoned to another world and no sign of the one who summoned him things become worse when he is attacked.