Flight Time Travel: My Battle Royale in the Tang Dynasty

[Chat group + group penetration + decisive killing + infrastructure + military] Flight 6688 from Lin City to Beijing City encountered serious turbulence in the air. The plane lost control and everyone fell into a coma. Opening his eyes again, the people on the flight traveled together and traveled back to the Sui Dynasty ten years ago. It was a time of trouble and the people were in dire straits. They were told by the system that there was a bug. They had to live here for 20 years before they could go back. If they died here, they would never be able to go back. Everyone made a unanimous decision and hugged Li Shimin's thigh tightly. Fortunately, everyone on the plane kept their secrets secret. There were doctoral students studying chemistry, experts from the College of Agriculture, students from the medical school, and hardworking social animals... Li Shimin: Sir, do you have any good ideas?