According to Baidu big data query, Paper Stack is Suzhou Paper Stack Network Technology Co., Ltd., which is a company specializing in network technology and game development. In 2020, for the better development of the company, it moved to Shanghai and established Wenyou Network Technology Co., Ltd.
Shanghai, referred to as "Shanghai" or "Shen" for short, is a provincial-level administrative region, municipality directly under the Central Government, national central city, megacity and core city in People's Republic of China (PRC)-Shanghai metropolitan area, an international economic, financial, trade, shipping and scientific and technological innovation center in China approved by the State Council, and a national historical and cultural city.