First of all, as a tool for the snake king to absorb mana, the white snake changed its owner to himself in Baoqingfang. At the same time, it is also a weapon to assassinate Buddhists. After the white snake lost her memory, Zhu Chai became a clue to find her memory and a witness to her love with Xu Xuan. In the decisive battle, the green snake pierced the Buddha's body with it, and at the last moment, the white snake sealed his memory with it. Five hundred years later, the seal was broken and White Snake decided to look for Xu Xuan. On the broken bridge of West Lake, it was this bead hairpin that brought them together. The use of this prop is very clever, and only in this way can we bear this heavy feeling, which is not at the same level as the pledge in the general story. Actually, umbrellas are also very important. Besides, the Legend of the White Snake already has a paragraph about "borrowing a lake to open an umbrella", so I won't go into details here.