MTL - Shoujo Grand Summoning - ~ 1917 Sleepy! hit! cut! kill! ...

As long as the land is square, Yan Bicheng should divide the world into four parts.
The dark organization “Ruyimen” has abducted children for many years, trained them as assassin agents, and sent them to the families of various countries for use in order to collect a lot of secrets, and gradually extended their evil hands to the court.
Feng Xiaoya, the favored minister of the King of Yan, suffers from bone melting disease. She is unparalleled in her “sickness and beauty”. For some reason, she abandons the eleventh wife, Qiu Jiang, and puts her under house arrest in the mountains. Qiu Jiang, who has forgotten his past, fled alone on a stormy night. After several twists and turns, on the way back, he met Yi Fei, the third prince of Cheng who was in trouble in a foreign land.
One wants to regain memory, the other wants to regain the throne. The two people who are incompatible with each other walk side by side towards Cheng in a bloody storm… but they find that the Ruyi Gate, which has been entrenched in Chengjing for a hundred years like a poisonous snake, seems to have undergone an unknown shock… …
The situation of the Four Kingdoms is back, and there is only one goal – to eradicate the evil organization Ruyimen!
However, as Qiu Jiang’s memory slowly recovered, a unparalleled secret finally surfaced…
Mrs. Ruyi, who is it? There is another mystery behind Ji Ying’s death?
What is the purpose of this return journey after a narrow escape, and where does it go?

- Description from novelbuddy

Lumberling, a 42-year-old civil engineer, grew numb to the monotonous rhythm of modern life. Hoping to rekindle his sense of wonder, he set out on a solitary nature trip, only to stumble upon an ancient, forgotten pyramid. A strange red light burst forth, killing him instantly… and binding itself to his soul.Cast adrift in the void, his soul found no rest, until he awoke in the body of a young foot soldier, bleeding and broken on a war-torn battlefield in a world not his own.Determined not to die again, Lumberling fights to survive in this brutal new realm where knights clash with monsters, kingdoms rise and fall, and mysterious powers shape the fate of nations.Armed with a strange ability to devour the essence of those he slays, he begins to carve out a new path, one forged by blood, strength, and sheer will.But power alone may not be enough. In a world where danger lurks in every shadow, and ancient forces stir in the dark, can a lost soul rise above fate… or will he be consumed by the very essence he seeks to control?

I became a scientist for an evil organization.…But I’m too competent.

Xiao Yu, who was a student from modern Earth, accidentally transports to another world and becomes the lord of a territory. Facing an unfavorable situation, he vows to take back his family business, build his new territory, kill all of those who covet his wealth, and dominate the world!

- Description from Novelupdates