Elf Kingdom: Game of the World Tree - Chapter 26 - The Most Shameless Player (Vote for Recommendation!)

Being given a chance and reincarnated is nice and all, yet why do I have to become that male friend who just watches the protagonist flirting with his harem?---World: Kaguya-sama: Love Is War - Hyouka ----

A man who was once called the world’s strongest agent ended up becoming a teacher after his retirement, to train a new generation of agents. After many years of training his disciples, he was killed at the age of 60 by a secret organization’s ruse and was reincarnated in another world with his memories intact. Though he was surprised by the existence of magic and the strange species in that world, he quickly adapted to his condition as a newborn and took advantage of it. He acquired special magic and gained a massive amount of strength thanks to his rigorous discipline, in order to reach his goal: Resume his career as a teacher which he left halfway through in his previous life. This is the story of a man, who, based on the memories and the experiences of his previous life, became a teacher who travels through the world with his students.

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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Yuanbao was born in ancient times, the only girl in three generations, the nickname is Jiaojiao, the big name is Bao, this is a proper script for the group favorite heroine.

However, Zhuangzi next door suddenly came to the young lady of the high official’s family in the city.

This young lady is a direct descendant, but her mother passed away early, her father continued, and the young lady was not welcomed, so she was sent out of the city.

“There is an ominous foreboding!”

Yuan Bao thought so.

“Little sister, you see how pitiful the little sister is, can’t you be a little sympathetic?”

A brother looked at the lady next door with pity on his face.

Yuanbao raised his hand and a pot lid flew over: “People are pitiful? They don’t have to worry about food and clothing, do they need you to be pitiful?”

“Good fight!”

Grandfather, grandmother, father, mother, many brothers, clapped their hands together.

A certain young lady is knowledgeable and reasonable, and said, “Being habitual is like killing a child. Your sister needs to be well educated!”

“roll!”

A brother stared directly, “My little sister is beautiful and kind, which one likes her?”

- Description from novelbuddy