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In the era of national awakening, all human beings will awaken their exclusive talents at the age of sixteen, and their abilities are divided from C level to S level. C-class is mediocre and common, B-class is already outstanding, and A-class and S-class are rare. Everyone in the world believes that talent level is the upper limit of life, but only a handful of people know the truth-- All abilities can be infinitely upgraded through practice. On the day of the protagonist's awakening, his talent did not even reach the minimum C-level benchmark, and he became a levelless loser that everyone laughed at. He didn't have an incredible start or a powerful talent, but he grasped the most secret rules of the world. Others rely on innate level to gain a foothold, but he relies on hard work to counterattack. No matter how weak the ability is, as long as it is polished to the extreme, it can break through the boundaries and soar. Starting from no rating and working his way up the ranks, he finally developed the most inconspicuous ability to a mythical level that shook the world. This is a legend about reaching the top with mortal skills.