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Unlike most Contractors the way Hei's method of becoming is known. Hei's sister, Bei(also translated as Pai) was originally the Contractor BK-201. After the incident in S. America, during the explosion, Bei used her powers (ability to manipulate objects on the molecular level) to merge herself into Hei in order to protect him. As a result of this, Hei gained his sister's powers, however he lacks a renumeration.