Thirteen-year-old Shanghai girl Zhu Shuhan developed 在场, a virtual study companion app, and earned about 18,000 yuan in three days. Her mother promoted it through Douyin livestreams and short videos, driving most orders through online channels. Zhu was not the developer behind widely circulated claims about million-yuan orders or a "frog foreign teacher"; those claims concerned another 13-year-old, Lv Sitong.