Bai Sheng is the experimental subject of the origin experiment plan. His strength, speed (agility), and physical strength are all incredible, but he has no origin. Without origin, it means that he cannot use magic, and most importantly, he cannot live forever.
However, it was impossible for the experimental team to give up on Bai Sheng. His inability to detect the origin was his biggest flaw, so he was exceptionally classified as a poor-quality experimental subject.
After ten years, the experimental team gradually discovered that Bai Sheng could already compete with S-class (top-level) experimental subject An Zu.
Finally, at some point, the experimental team lost control of Bai Sheng. All the experimental subjects were released, and all members of the experimental team died. Bai Sheng swallowed something called "Origin Liquid", and unexpectedly the breath was released. Humans who have not been modified will turn into monsters without self-awareness when exposed to it, and they are extremely contagious. In less than a month, most humans around the world have turned into Origin Beasts, and the government was caught off guard.
Everything started in vain, so everything must end in vain. He sacrificed his memory and entity and turned into a sapling. Only tens of millions of people in the world recovered. Fortunately, many of the origin beasts exploded in this sacrifice, and there were only more than 500 million origin beasts left. The recovered humans all possess a magical power called "origin". From then on, the battle between humans and origin beasts began.
Thousands of years later, a sapling turned into a baby and was reborn into the world. A mysterious man took the baby away and named it Bai Sheng.
Concept: Why does the heart of a creature without emotions hurt?