I tinkered with cars and built a super military industry

Introduction: The reborn Li Yifan returned to 18 years old and started working as an apprentice car mechanic. Later, he obtained the car super scanning system, became a master of car repair and modification, and established the best-selling car brand in the world. Just when everyone thought the protagonist could live a happy life, the protagonist revealed powerful military weapons and put an end to the global war...