Full Level Proficiency

Lin Du traveled to a world centered on "proficiency" and became a useless person who couldn't even open the panel. But when he fell from the city wall but survived, everything changed - he saw a skill tree that others could not see, had the ability to "synthesize skills", and a mysterious mark that resonated with ancient ruins appeared on the back of his hand. The useless people in Greystone Town have become the only key to open the "Gate to the Root". This is not a story about upgrades. This is a story about "possibility" - when everyone is limited by the law of proficiency, only he can grow infinitely.