How could Ye Fan not know Leng Mei's identity? It's just that Leng Mei doesn't know his exact appearance.
After getting the physical characteristics of Leng Mei from Ye Juanjuan, he understood that it was Fire Phoenix who planned all of this; from kidnapping Mengyao to Biyao, it was all Fire Phoenix's doing.
As for the black-clad attackers, neither Ye Fan, Shen Yaqing, Zhang Lu, nor Qiu Wen had seen them personally, otherwise Ye Fan would have gotten some accurate information to judge the identity of the black-clad individuals.
The Shadow Guard led by Leng Mei was one of the Terminator's two major shadow guards, with each appearance marking disaster and destruction, and the Shadow Guard under Fire Phoenix's command is led by Leng Mei.
A question had been troubling Ye Fan, making him unable to figure out who was behind all of this. It wasn't for profit or revenge; it seemed like a test of patience as no information leaked out. Now it's clear.
