The mentor of both Canaan and Alphard
Siam is an assassin who took in Alphard when she was young. He raised her to be a soldier and had originally named her "Canaan." However when Siam found the Canaan we know, he trained her and starting giving all his attention to her due to her synethesia. Alphard got jealous and hated Canaan while renaming herself.
When the girls were teenagers, they went on a mission that took place on a train. At the last minute Canaan burst into one of the cars to find Siam on the ground and Alphard pointing her gun at him. Expressionlessly he took the bullet to the head. Alphard then explains she was working for someone else but truthfully she was just upset with Siam and angry at Canaan for taking her only father figure. She had decided to return the favor.
On Siam's side however, he wanted Alphard to kill him. He had felt it would have been better for Canaan to learn the tragedy of loosing someone and the feeling of being double crossed. A good soldier knew that and so he wanted Canaan to know as well.
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