Chu Huaiwang let Han Wangcheng and Wei led the troops to fight, but in the end, Wei's army easily won more than 20 cities of Qin, while Han Wangcheng's army failed to win Qin Cheng, and he still got the help. This shows that Han Wangcheng's ability to lead troops to fight is very poor. As a counselor, Sean could only give a plan. Even if the plan was perfect, Han Wangcheng was unable to carry out all the contents of the plan, which led to the failure of Han Wangcheng's army again and again.
Second, Zhang Han's military capability is too strong.
Zhang Han is the last star of the Daqin Empire. If Zhao Gao, the eunuch, was not in charge of the state affairs, and Qin Ershi and Hu Hai were incompetent, it is not certain that Xiang Yu could finally destroy Daqin. Han Wangcheng's army met Zhang Han's army, and even with a senior adviser like Sean, it couldn't beat Zhang Han. After all, as a famous soldier, Zhang Han has rich combat experience, and he is only a Han Wangcheng, not his opponent.
Third, The Art of War is not a military book.
In those days, Sean met an old man. After the test of the old man, the old man gave Sean the art of war. When he gave this book to Sean, he also said that you could become a good counselor after reading this book, but he didn't say that Sean could become a general like Tian Lei and Wu Zixu after reading this book.
Fourth, there is discord between the monarch and the minister.
Sean intends to revive South Korea, but Han Wangcheng has no such intention. He feels that South Korea is really too small and its military capability is not comparable to that of other countries. It is only a matter of time before this country is destroyed. Therefore, it is only a matter of time before he fights Sean, which always leads to defeat.