During the Warring States period, princes fought for hegemony and politicians stirred up troubles. {Su Qin} was born in a poor family. After studying under Guiguzi's family, he came down from the mountain. He was frustrated in lobbying the King of Qin. He understood the current situation through Xuanliang and spurred others to understand the current situation. He created a "joint vertical" strategy to unite the six countries to fight against Qin, and he reached the top by wearing the seal of the six countries. Fellow senior brother {Zhang Yi} was well versed in the art of "union" and was highly valued by the King of Qin. He used his wisdom to sow discord among the six kingdoms and vowed to disintegrate the alliance. The brothers were both enemies and friends, and they had a peak showdown on the stage of the Warring States Period. The vertical and horizontal confrontations reshaped the fate of the princes. In the end, Su Qin was assassinated, and Zhang Yi helped Qin lay the foundation for a unified hegemony, composing a historical legend of vertical and horizontal wars.
