Summer
窦宾玲, 窦冰凌, Summer, Kiki, CC, executive secretary of a startup incubator company that is currently listed in public records as "abnormal operations." She is friends with Xie Yihua and the law firm that Ma-ge (aka military intern) works at. Summer and Xie knew each other before August 2021, but pretended to be introduced into Zhang Zhehan's fandom by Sophie after 813. She falsely claims to be a lawyer and to have graduated from Tsinghua University.
Summer manages at least six different Weibo accounts in Zhang Zhehan's fandom. The account in the last screencap, 西伯利亚理发师, is associated with writing the script for the IG divorce video.
The most controversial of these accounts is CC3400. It appears to exist for the sole purpose of attacking solo or ZSJ fans whom it deems problematic and posting evidence of their "crimes" against the teashop, the brand, Xie Yihua, the ZSJ echo wall account, the official fanclub, etc. It was criticized by many ZSJ fans for exacerbating strife within the fandom and not blocking antis, who frequently used material it posted to attack Zhang Zhehan.
In late August/early September 2022, several ZSJ fans posted detailed analysis of why they believe CC3400 and Kiki to be the same person. These include location, phone model, phone notification icons, close associates, writing idiosyncrasies, screen recording app used, posting/travel dates, and posting times.