The people of Tang Sect, now that they knew, Yi Xiaofei had no choice but to kill to silence them.
This wasn't cruelty!
It was the law of the jungle, because if Yi Xiaofei didn't do so, he would be putting himself into a desperate situation.
A Heavenly Spirit Crystal Mine could incite too many disputes, as it now involved the interests of those in the Heavenly Realm.
With enough Heavenly Spirit Crystals, one's strength could increase rapidly, and what the powerful Tang Sect needed were even more Heavenly Spirit Crystals.
This was a vital resource for a power, and now that the mine was under Yi Xiaofei's control and equally shared with Antian Liangzi, after its exposure, Antian Liangzi wouldn't have any issues.
After all, Antian Liangzi had the Antian Clan backing her up, whereas all Yi Xiaofei could rely on in the end was himself.
The mine was too important to lose, that became the only belief in Yi Xiaofei's mind.