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In 497 BC, Yue Wang Yun Chang died and Gou Jian ascended the throne. The following year, Helvnan conquered Yue, and Fan Li used "death squads" to defeat the Wu army with fewer troops and more troops. Helu died of a foot injury on the way back, and his eldest grandson Fuchai ascended the throne. Fu Chai rekindled the war three years later in order to avenge his country. Wu Zixu and Sun Wu used the Five Elements and Bagua formation to kill the Yue generals and force the Yue king and his ministers to Kuaiji Mountain. However, without knowing it, Wu Zixu's second son Wu Xin was killed by his brother...

Wu Zixu has been working hard for King Helu of Wu for many years, and now all the major tasks have been completed. Zixu wanted to take revenge with his troops, but Helu always refused to give Zixu a chance to speak, and kept delaying it with excuses. Helu's biggest concern at this time was the battle for the throne between his second son Ji Dan and his eldest grandson Fucha. Ji Dan shows off his sharpness and exerts all his scheming; Fu Chai worships Zixu as his teacher, he is forbearing and humble, keeping his voice and expressions to himself. After experiencing the turmoil of hunting, the unjust case of witchcraft and other incidents, Ji Dan, who was too impatient, died by his own hands. But his "close friend" is missing. This person appeared in multiple identities in subsequent major events. Who is this person?