I Don't Know How to Cultivate Immortality, but I Can Cultivate Immortality Scientifically

When he traveled back in time and became Prince Liu Qian, he originally wanted to keep a low profile, but the mess in the Qian Kingdom didn't allow it - the treasury was empty, powerful enemies were everywhere, and old foxes all over the court were waiting to see his jokes. Fortunately, he is a science dog. No magic? It doesn't matter, I will do "infrastructure construction". Since then, the style of Qianguo's painting has changed dramatically: the communication jade talisman has been replaced by the "instant communication network", and the national defense formation has been upgraded to the "all-area missile defense system"... When the enemy coalition forces arrive at the city, what awaits them is a swarm of drones that can cover the sky and a rail gun capable of killing immortals.