She can be killed.
Ye Wuming has already done it...
But Zhao Changhe felt he was being a bit of a double standard. Though he told Han Chi that "being passive means just that," he truly felt there was no reason to kill Piaomiao. She did nothing wrong and only did good deeds, so why kill her? Perhaps it's not exactly double standards; the standard is simply the distinction between good and evil.
Unlike Ye Wuming, who had an attitude of "even if the orchids are blocking the way, I will remove them" for his goals. Good or bad, he would kill them all.
In summary, what Piaomiao said earlier wasn't wrong... For the current world and its people, Zhao Changhe is a pillar, and Piaomiao is his great aid; she was born for this purpose.
