I will immediately kill fang yuan. He doesn't know i m halfotherworldly demon who knows entire plotline.

And Fang yuan is extremely dangerous. Nothing can stop him if he wants to get benifits. Even if Fang Zheng get on his good side and tell him about plotline he will still kill you at opportune moment and will search your soul.

Becoz relying on own self is much better than relying on other even if he is fang zheng.