It's pure fabrication and inconsistent with history.
Yinzhen: I always remember that I've loved you.
Yinxiang: I will always take care of you and protect you, because you are my sister.
Zebu: With just one look from you, I will burn myself without hesitation...
Ruoshui: I know that no matter where I go, you will be by my side, cry with me, laugh with me, wait with me, bloom with me...
There is a city called the City Without Tears, because the people here only laugh and have no tears. But later it changed. This city is still called the City Without Tears, but because the tears of the people here have all dried up...