It’s Elena. In the work "Detective Mike Fox Thousand-Faced Thief", the real identity of the Thousand-Faced Thief is Elena. Elena is a mysterious female thief who is known for her thousand faces. She is good at disguises and cross-dressing. She often changes her identity and face, making her elusive. He is an extremely smart and cunning character who is good at disguise and deception, making him easy to carry out criminal activities.