Yin Yang

He is a CIA agent working with Seraph.
Like Seraph, he is a martial arts expert, but he is also well versed in information security management and has created a variety of gadgets of his own design for use in operations.
He is basically a cynical person, but he is always courteous to those who recognize his abilities.
He also has a quick wittedness that allows him to instantly fight alongside Yvet and her team in the rescue operation of Paulownia.