Lin Yan traveled to the end of the Warring States Period in 236 BC, bound to the "Technology Assistance Emperor System", met with Ying Zheng as an alchemist, presented the blueprints for improved siege crossbows, and was awarded the title of "Technical Marquis". He gradually unlocked metallurgy, medical, communications, chemical and other technologies, helped the Qin army quell civil strife, improved logistics, and first showed its technological power in the battle to attack South Korea. Later, Lin Yan used technological weapons such as repeating crossbow formations, simple artillery, and steam warships to help Yingzheng sweep through the six countries, establish the Qin Dynasty in 230 BC, and was awarded the title of "Science and Technology Marquis".
After the establishment of the Qin Dynasty, Lin Yan developed generators, telephones, and radios to promote global exploration. He used science and technology to reduce dimensionality and conquer America and Europe, unify the world, and establish the "Qin Empire Global Federation." He unlocked the life solidification system, achieved eternal youth for Ying Zheng, and opened the space era. The Qin army landed on the moon, conquered Mars and Venus, formed a space fleet, defeated the alien nomadic races on the edge of the solar system, and unified the solar system.
After marching into the Milky Way, the Qin Empire successively conquered the Zela Galaxy, defeated the Karon Empire, and finally launched the ultimate contest with the top civilization, the Atlantis Empire, to unify the entire Milky Way, and Ying Zheng became the overlord of the Galaxy. After the ultimate mission was completed, the system opened a space-time channel and asked Lin Yan if he could return to his previous life. Lin Yan refused to go home and chose to join hands with Ying Zheng to fight in the more distant universe. The Qin Empire's galactic fleet sails towards the unknown sea of stars, embarking on the road to domination of the universe.
