Jiang Nan was famously useless. While other people could hatch their battle-beast eggs in just three days, it took him a full three years. Just before graduation, Jiang Nan finally hatched his own battle-beast egg, only to find a damn System inside it… Having a System should have meant he was about to take off, but who could have guessed that he would need to refine Gu worms to activate it? So much for getting something for nothing. So much for a protagonist’s halo! Jiang Nan had no choice but to start refining Gu worms, but the requirements were incredibly strict: he needed ten thousand creatures of the same species. Where was he supposed to find those? Jiang Nan was tempted to use the billions of troops inside his own body, but he was afraid the System wouldn’t accept them… In the end, he could only choose it as the material for refining Gu…
You can take a look, it's more fun and doesn't burn your brain