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After staring at the lawn for a while, he changed the topic and continued: "Ever since I saw Doctor Xiao Hei, I knew that you are not an ordinary person. Although I do not know who you are under the identity of a doctor, but I believe in my eyes, I will leave you this key, and hope that one day Bai family can be of use to you."

A single card could open the lifeline of the Bai family