The Fate Altering Resurrection Pill could resurrect the dead and overturn Yin and Yang Laws order. In fact, it was the only Heaven-defying pill capable of altering one's fated death.
Xia Jingyu left the pill for Qin Xianer in order to help her and Su Yu. After all, Xia Jingyu obviously loved Su Yu too, which is why Qin Xianer had entrusted him to her before her death, then chosen to sacrifice herself.
It was just like how she had sacrificed herself several times before to help Su Yu and Qin Xianer. Her final act had proven that she was still as kind hearted as ever.
Su Yu's heart was filled with grief and shock. He had misunderstood Xia Jingyu. She was obviously not a heartless or treacherous woman.
