Apart from the Creation Method, the Dan God Secret Realm is his greatest secret. Even though he is very fond of Xu Yu Rou, he could not possibly reveal the matters of the Secret Realm to this girl, let alone casually hand over the control of this Secret Realm to her.
An innocent man incurs blame by harboring guilty intentions; not everyone possesses the same ability to follow the Path of Survival as he does.
Furthermore, the Dan Immortal Master would continue to exist within this Secret Realm, so it's better to let him choose the next successor.
After arriving at the Dan God Secret Realm, Zhang Dao Xuan's figure appeared, and he smiled as he asked, "Is everything settled?"
Lin Yi nodded. "Master, everything's been settled. Just waiting to ascend now. It's really hard to leave you, old man. I so wish to continue learning by your side."