The Empress Dowager was already weak, her high fever not subsiding.
Upon entering the palace, Su Pan'er realized something was amiss. While casting a spell to protect the Empress Dowager's heart vein, she also secretly fed her a drug that stimulates the potential of life.
Back then, it was this medicine that enabled Ye Han to feign death, disguising himself as an old man who had passed away, thereby evading the massive search by the Seventh and Eighth Masters.
Afterwards, when the effect of the drug burst out, he single-handedly annihilated hundreds of people dispatched by the Seventh Master for his assassination. He even drove the Seventh Master to jump off a cliff...
However, Ye Han wasn't the Empress Dowager. Although Ye Han was able to withstand the aggressive effect of the drug, the Empress Dowager, with her weak constitution, couldn't!
She had originally ordered her people in the palace to make a series of preparations for the Empress Dowager to survive this crisis.