"The side effects of the new drug appeared at the end of the first month after Beicheng's treatment. At that time, it was only occasionally forgetful. I still had a glimmer of hope that only minor side effects would disappear when the treatment was over. He was afraid of your worries. He didn't tell you or let me tell you. However, with the deepening of late treatment, the severity of his sequelae has increased dramatically. Just last month, when he woke up one morning, he suddenly did not know me and the cold, and he did not remember who he was. Gao Han and I told him about his identity,...