How Did I, Who Was Born in the Wu Generation, Become a Gnawing Old Man?

A bedridden grandfather, a frail mother, a taciturn father, and a poor family. Traveling to a different world, starting from a baby, Zhao Yu lived in obscurity as the son of a woodcutter. It wasn't until he was fifteen years old when the village bully came to bully his parents that Zhao Yu realized the helplessness of his humble status. At the same time, the proficiency system was awakened. Zhao Yu, who aspired to become a warrior, followed his father up the mountain to chop wood, and started to accumulate proficiency by chopping wood! But gradually... Zhao Yu discovered that something was wrong. How could he have completed the task of chopping 100 trees issued by the system after he had worked so hard to chop down a tree? After drinking a bowl of ordinary well water, my fitness progress increased by ten points? Is the system crazy or the world crazy?