Wang Yunxiao certainly had good reason to suspect that the person behind Li Mumu's account had changed.
After all, that's exactly what had happened to him.
Waking up to find oneself completely clueless about everything.
He was rather fortunate, having not ended up on the streets after his own transmigration, surrounded by close brothers who never harbored great suspicions toward him.
Moreover, Wang Yunxiao's temperament and character were not much different from his, allowing for a seamless transition.
This sort of thing... you could hardly tell whether it was transmigration, or whether Wang Yunxiao himself had suddenly received the memories of a future persona.
The current Li Mumu appeared no different from him at that time.
It was still the same person, but what lay inside was hard to say.
Just starting on the account without knowing anything, she played the cold reading tricks, a professional skill not just anyone could master.