The Schoolgirl Secret Agent - Chapter 2747

Among the demons, the supreme ones are called “Great Saints.”

A young man leaves his mountain village and travels around the world. By unceasing efforts, he finally becomes a legend of the age.

- Description from Novelupdates

He lived from BC to the Middle Ages, from the Renaissance to the Industrial Revolution, and from Cyberpunk to the Interstellar Age. He has been a king and a prophet, a knight and a nobleman, a versatile artist, a genius inventor…
This is a four-thousand-year human epic——
“To us four thousand years from now:
“Is the world at peace? Is famine extinct? Can people touch the stars? How long is the human lifespan? How far is the boundary of the earth? Human…do you remember us?”
——Excavated from Earth Age Tenth Century BC, Solomon Prayer Book.

- Description from novelbuddy

Traversing to another world, Lin En is captured right from the start. The captor is the antagonist princess from the original work, intending to control him by using him for hypnosis experiments. In a critical moment, Lin En comes up with a quick-witted plan, feigning the success of the experiment and deceiving her with his acting skills. But this was only a temporary measure. Because in the original story, her ending is very tragic, and none of her associates meet good ends. Hence, Lin En must pretend to be under the hypnosis while secretly being ready to flee at any moment. But gradually things start to take an unexpected turn. ... The Princess’s Diary [The experiment was a success!] [As the sole specimen, I’ve decided to keep him by my side.] [Due to the curse mark on my face, I am loathed by the public, but he says I’m beautiful.] [I’m happy because people tell the truth when hypnotized.] [Alone with him, I impulsively kissed him.] [The feeling was strange and made me lose my composure, fortunately, he won’t retain any memory of it after the hypnosis is lifted.] [So, it’s okay to be a bit bolder, right?]