An unknown person who sends threatening and obsessive messages to Xue Ci, calling him 'baby'. The stalker knows intimate details about Xue Ci's daily life, including what he wore and who he interacts with. The voice on calls is processed with a heavy mechanical tone. The stalker claimed to be able to solve Xue Ci's homework problems and threatened Xie Yishu. Xue Ci refers to this person as an 'external virus' and a 'pervert'.
