On September 17, Cai Xiaodan, widow of engineer Zhang Liang, and her family were invited to negotiate with Beijing Fanghong Intelligent Technology Co., Ltd., a subsidiary of Tsinghua Tongfang. The company promised twice to provide a written response by the end of the workday on September 21, but as of September 23, it has failed to do so, nor has it provided the requested materials such as work records, attendance sheets, and payroll records.