In order to get enough blood, the emperor forced maids of honor to take medicine to speed their period, which leaded many maids to die of loss of blood.
In case this cruel behavior would be leaked out, he even killed every maid in the loop .
Desperately, the maids decided to trigger a coup before death.
Unfortunately, they failed and all there girls who were evolved in the coup were all tortured to death.
As a matter of fact, this is just one of the storied about Chinese emperors who fall for immortal.
In a way, in my opinion, their behavior just reflected how spiritually weak they are after holding the power.