Age of Mecha: Divine-grade Genetic Extraction - Chapter 61 - Clues About the Holy War Organization

Due to an unexpected turn of events, Xia Fei consumed a Super Gene Optimization Fluid that bore no brand, expiry date, instructions or stated its place of origin.
Our story begins here…

My name is Lü Jincheng, there are quite a few who have seen my works, and they call me Boss Lü.Before he had time to properly say goodbye, the top player Boss Lü is reborn in 2014, back to his youth.Suddenly equipped with a masterful skill in wooing women, his career becomes effortlessly successful.In a hedonistic life, there remains only the desire to do as one pleases.This book is also known as 'How to Break Free from the Shackles of Intimate Relationships' and 'Boss Lü’s Life is Destined to be Without Regrets' among others.

This is the story of a person who transmigrated into a world with a radically different worldview.

So different, in fact, that he is considered a female in that world!

Cheng Nuo: What? Why did you say that I’m female?

Author: You only have one Tintin. The males of this world have two Tintins.

Cheng Nuo: No way! My hands are itchy… I want to cut one off!

- Description from Novelupdates

An ordinary student, a wretched peeper, a cowardly teenager with a kind heart. In a terrorist attack, he inherited the knowledge of countless elites, embarked on a path of God Jagged Tu…

He is an artist!

He is a mathematician!

He is a psychology Doctor!

He is a master of fighting!

In fact, he is a man

Taken off raw site:

A wretched, dirty young man is working during the summer when he was caught up in a mysterious explosion. After that explosion, the young man is then left with the memories and knowledge of dozens of the world’s experts.

He has changed, his heart has become cold, iron-blooded. He became a killing machine, his mind turned mechanical, calculative. Everything goes according to his plans and calculations!

In this magical, slaughterous world, a door is opened for him…

- Description from Novelupdates