MTL - History’s Strongest Senior Brother - ~ End this testimonial

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

There was a Senior Brother and a Junior Sister. One of them was transmigrated to this world and had cheats while the other was the reincarnation of a Great Emperor.

Mark is a genius military weapon designer who was kidnapped by a mafia gang after refusing to work for them.
They forced him to design unique weapons for five years, until one day he successfully escaped only to get shot by his trusted comrades.
*Ding! You awakened a weapon system.
When he opened his eyes, he was in a different body and in a different world.
"You want to kill a wild boar without being detected? Forget about bow and arrow. Here, I present you this sniper rifle."
"You want to kill a horde of goblins from the sky? Forget about those flying carpets and brooms. Here, I present you the fighter jet."
"You want to kill a dragon? Forget about taking the help of the S-class adventure team. Here, I present you a nuclear bomb."
Join Mark Spencer/ Lu Zhen as he brings the whole world to its knees with the help of his weapon system.
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Note: Author isn't born in an English-speaking nation and has no editor either. So, please be understanding if there are any grammatical errors.
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This story is a rehash of the Pea Princess but set in ancient times. It tells the tale of an elegant maiden, and a doting, loyal puppy who also happens to be a rugged hunter! He was serious about pampering his wife! Yue Jiaojiao woke up in the body of a beautiful girl who was grievously injured from leaping off a cliff. If she hadn’t been rescued by a hunter who was passing by, perhaps she would have died. Looking at the soft, delicate “little fairy” in front of him, the rugged hunter decided he would play the role of a loyal puppy to the max!

The delicate Jiaojiao was a clean freak, so there would always be hot towels ready all day long. Jiaojiao was being disturbed by her uncle and aunt? Hurry up and sever all ties with them! Jiaojiao’s feet hurt from walking? My arms are capable of lifting her! Jiaojiao said she wanted to marry me? Zhao Zhan was stunned. Was this real? Was this not a dream?

Generally, Yue Jiaojiao would never have offered herself in return for being rescued. However, the rugged hunter was too awesome!***As time passed, Zhao Zhan realized that his wife was a real lucky star. Ever since she entered his life, he had happiness! And wealth! Even those evildoers who framed Jiaojiao had already been dealt with! Still, in comparison to his material possessions, Jiaojiao will always be the most precious gem in his heart. She was the treasure that he would pamper till the world’s end!