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The true identity and exact origins of Li Feiyu were unknown to anyone, but they speculated that Li Feiyu was most likely a powerful Practitioner of the True Martial Realm from the Devil Region, or less likely from some other domain.
The Collection and Supplement Method was deeply hated by the righteous path, but there were still many Practitioners who secretly cultivated it and captured female Practitioners in secret to use as cauldrons.
If Li Feiyu was the latter, then he was a True Martial Realm Emperor Wu pretending to be virtuous. In other domains, it was not good to harvest widely, so he came to the Daqian Empire to do these things, changing his identity so that no one could track him down.