Zhou Yi is not interested in taking away Ruyi Iron from Zhu Wei for the time being, so he put it there for the time being.
He plans to wait until he returns, and then see if he can exchange Ruyi Iron through reincarnation space.
Of course, even if he gets it now, when he leaves the world, he can only exchange things through reincarnation space to belong to him.
This is probably the biggest difference between the reincarnation space and the main god space that was heard of in the previous life of the Book of Changes.
In the reincarnation world, nothing can be brought to the real world except knowledge.
So Zhou Yi often shows