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Ms. Jingjie Zhang is Chief Financial Officer of HJ Science Co., Ltd. from September 14, 2023, serves as its Joint Board secretary since June 25, 2025 and served as its Board Secretary since September 14, 2023 until June 25, 2025. Ms. Zhang joined the HJ Science Co. Ltd. on September 14, 2023. From October 2019 to September 2023, Ms. Zhang worked as a senior auditor of Deloitte Touche Tohmatsu Certified Public Accountants LLP Ms. Zhang obtained her bachelor’s degree in business from Chengdu University of Technology in the PRC in June 2015. Ms. Zhang obtained her master’s degree in political economics from Sichuan University in the PRC in June 2019. Ms. Zhang obtained the award of Career Mentor at School of Business, Chengdu University of Technologyissued by School of Business, Chengdu University of Technology in June 2025.