While ChatGPT's technological innovation has attracted worldwide attention, the risk of personal information leakage is particularly significant. Upon analysis, the primary cause for people's apprehension lies in the ambiguous origin of ChatGPT and the uncertain utilization of users' input information. These substantive issues can be distilled into challenges to the information subject's right to know. This paper takes ChatGPT, a representative generative artificial intelligence, as a case study to elucidate its effects on the information subject's right to know throughout various stages. To balance technological innovation and the rights of information subjects, priority is given to guarantee the rights through technical means. It is proposed to explore a path towards countermeasures through collaborative efforts of industry, administrative and judiciary authorities.