[Today's second update is delivered!]
Ye Tianchen intentionally let Bai Song go and did not kill him, hoping to follow Bai Song to see where he would go. Additionally, Bai Song guarded the so-called "Feathered People Master" boundary stele, and if he were to be killed there, some consequences would inevitably arise. By then, it would not be easy for Ye Tianchen and his companions to roam freely in Earth's secular world!
It's like the sentry guarding the city, if the sentry isn't dead but actually enters, in the short term, no one can detect anything amiss. But if the sentry is killed, someone is bound to discover there's been an intrusion, and a comprehensive search would definitely ensue!
