In this segment of thoughts that Wen Nan is reading now, although he can clearly "hear" Mo Yu's thoughts, there is always the "chirping" sound that only characters controlled by the soul threads have, mixed in the background.
Those background sounds should be the voices of the [Countless Threads] that Wei Zhe is controlling.
However, unlike Zhang Yanan, who is completely controlled and loses her own soul as an NPC, Wei Zhe, although exerting a certain degree of control over Mo Yu, still leaves the main control of the body to Mo Yu herself.
Wen Nan thought, to make an inappropriate analogy, the unseen [Countless Threads] attached to Mo Yu, are not like puppet strings, but more like a dog leash.
No wonder she was a character brought into the instance by Wei Zhe from the outside; Wei Zhe has a relatively high level of trust in these "twin siblings."
This indeed provided convenience for Wen Nan, making his strategy possible.
