C441 The Strong Are Always Strong and the Strong will Never Change!

In the hinterlands of human civilization, crimson level technology blueprints, high and low, are confidential documents.

Very few people could see it so easily.

Unless those families had been researching Crimson level technology for generations, only then would they be able to observe it.

Time flew by. One day, two days, three days.

Wu Zhi drew day and night without stopping