Dear Mr. Shi - Chapter 90 - The reason is very deep

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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When The Cute Kunoichis Spied on Their Teacher's Secret is a light novel written by Kazuma Kamachi and illustrated by Ryuushi Tajima.

The story takes place in a world where Japan never ended their isolationist phase, and agents from foreign powers are always threatening to steal the country's advanced technology. In order to combat this threat there has been a resurgence of ninjas that use Strategic Martial Arts, techniques that combine cutting-edge modern technology with a traditional foundation of martial arts and ninjutsu. The story follows Souha Sugiyado, a 17-year old ninja instructor and former ninja prodigy who was forced to retire from active duty by the wounds he suffered in his last mission. Souha's four students are all kunoichi who have all gained the rank of Elite Ninja, the highest official rank available to ninja. However, one day two Shogunate ninja approach him with the news that his four students have gone rogue and have stolen a portable modular nuclear reactor, and thus they ask for his help in bringing his students to justice.

An ordinary academy boy, Baiyunlou, had to meet the opportunity to embark on the road of self-cultivation.

It is Baiyunlou’s lifelong wish to sit in the small building and watch the clouds and clouds, and wander around the world to taste the red dust and fireworks.

However, the catastrophe is approaching, and the only way to rise up is to draw out the sword, for the thought in the heart, for all living beings in this world, to cut out a life.

A young man by nature, never forgetting his original aspiration, and comprehending the Dao in the mortal world.

Step by step to the top of the fairy road, to explore the truth of the heavens and the world…

“Fellow daoists, come to the small building to drink a cup of tea while you are free in the world of mortals~”

- Description from novelbuddy

*TABOO CONTENT***********Caution******STRONG SEXUAL CONTENT*THIS CONTENT IS VERY HARMFUL FOR A NORMAL PERSON'S MIND...Meng hao a corporate worker got transmigrated in a cultivation world and awakened his Milf hunting system and started his journey of “ Milf hunter”..Senior sister: Junior brother you is truly is the best.... I love you let's have some thrill on bed....Master : Disciple it's time for you to let your master taste you......As, I heard that it was very thrilling experience for your junior sister,Let me experience it too.....Daughter of luck : Junior brother... I love you.Seeing all the girls behind him Meng hao said while standing on a mountain peak and seeing the long line he said“ No need to fight everyone would get their chance”