Holding his sister's hand, Qiao Renyu asked Yazaki for an apple pie.The brother and sister communicated through childhood nursery rhymes and code words of memories, but the Japanese military surveillance did not notice anything unusual.Qiao Renyu falsely promised to reveal the whereabouts of the banknote printing paper and demanded that his sister be released first.
After Qiao Yinwan left safely, he took advantage of Yazaki's unpreparedness to attack him, then jumped off the building and sacrificed his life to protect the secret.Qiao Yinwan was heartbroken after witnessing her brother's sacrifice.