Liu Qiaonan has lost her memory. Whether this is true amnesia or fake amnesia depends on Qiao Nan herself.
Since Bi Qing had been waiting for the position of head of the department for three years, with the advice of several unreliable apprentices of Bi Qing, Bi Qing decided to accept the amnesiac Liu Qiaonan, named her Bi Nandi, and began her journey of raising a child.