No, wait a second. For starters, how could Ailín be so certain that the energy he detected came from Lu Yizhou? What if it was Ozzie? After all, she was a cat familiar and she was not a human. Could her energy be mistaken as Lu Yizhou's, causing Ailín to be confused? But at this point, he should have known that Ozzie was not an ordinary cat. Then why did he specifically point Lu Yizhou out?
Or… was it because he was a transmigrator and that's why Ailín's skill card deemed him as a non-human aka someone who was not from this world? No, that's not right either. Lu Yizhou had taken Irene's identity so whatever Ailín sensed must be coming from Irene, not Lu Yizhou. And well, Lu Yizhou had always been suspicious that there was another transmigrator among them.
But if that was the reason, why did Ailín sense Lu Yizhou alone and not the other transmigrator?
Or… was Ailín the transmigrator himself? Was that why he wanted to test Lu Yizhou using this method?
