"I figured it out! I finally figured it out!" Karl jumped out of bed, with the confrontation between Kant and Hegel in his mind. Young Karl entered the first university in Prussia, the University of Berlin, which made him temporarily forget his unrecognized love with Jenny and those unanswered letters, and also forgot the busy but wasted time in the pub before. He began to walk step by step on the path he wrote in his high school graduation thesis, thinking, researching, fighting, and dedicating everything for the happiness of mankind! "The Leader" tells the life of Karl Marx, a revolutionary leader who influenced the world. Marx is a great man who stands tall and upright. The ideological system he built throughout his life awakened the sleeping proletariat all over the world and profoundly influenced the pattern of world historical development; Marx is also an ordinary person with flesh and blood. His love with Jenny despite everyone's opposition, his friendship with Engels that he almost missed, the evolution of his philosophical thoughts, his political and economic thinking that influenced the world, his contribution to the proletarian revolution, his great side, and his ordinary side, finally became a legend handed down from generation to generation.