She left the prison with a smile on her face, the deal was done. The day Dai Zhangye went to court would be the day of his liberation. The biggest surprise she received from her meeting with him was what he told her before he was taken back to his cell.
His life was not in danger because of what he saw; it was in danger because of what he saw and recorded. Whatever it was, if it implicated the doctor then she was sure the Aoi organization, and the Chu's were implicated as well.
She had instructed him to call whoever wanted him dead and say that he wanted to trade his freedom for the recording. He would promise to give them further information on the day he was meant to appear in court.
If he was asked about her, he would tell them that she was looking for information on a missing person that he used to know back in his army days. He was free to improvise on the identity of the missing person since they would never know anyway.