From a historical point of view, Qin and Zhao belong to the same family. They are all won surnames, and their ancestors are Shang Zhouwang's general Fei Lian. Later, due to their respective merits and demerits, they were divided into two places, one for Qin and the other for Zhao.
In 262 AD, Qin and Zhao confronted each other head-on, and the battle of Changping was originally a close battle. However, the prince of Zhao listened to the rumors and replaced Lian Po, the great warrior of the former dynasty, with Zhao Kuo, an armchair strategist. As a result, 400,000 Zhao troops were raped and killed, completely breaking the deadlock. You know how huge the number of 400,000 Zhao troops is. At this point, Zhao was heartbroken.
Since the Spring and Autumn Period, Qin suddenly rose from a barbarian country to a world power, which can be said to be at odds. Qin and Zhao, with equal fighting capacity and constant friction and conflict, fought for half their lives, and finally were at loggerheads. In fact, they were originally a family of the same origin.
Sima Qian's Biography of Zhao in Historical Records said: "The ancestor of Zhao, but the ancestor of Qin."
Qin and Zhao are neighbors, and Qin's outward expansion will inevitably lead to constant friction with Zhao and strengthen Pk. In the end, in the battle of Changping, Qin killed 400 thousand soldiers of Zhao, and Zhao was never recovered. Qin and Zhao forged a feud. Qin eventually swept the six countries and unified the world.
It's normal that water and fire are incompatible. In the face of political and power struggle, the intimate relationship between father and son is pale and powerless, not to mention the relationship that has been separated by so many generations.