The Board of Directors of Tancheng Group Co., Ltd. approved the immediate dismissal of Onestop Assurance PAC as its independent registered public accounting firm on February 27, 2026. Onestop Assurance's audit reports for the fiscal years ended December 31, 2024, and 2023, included an Emphasis of Matter paragraph and an explanatory paragraph describing factors that raised substantial doubt about the Company's ability to continue as a going concern. No disagreements on accounting principles or practices, financial statement disclosure, or auditing scope or procedure were reported with Onestop Assurance. Material weaknesses in the Company's internal control over financial reporting were previously disclosed in the Annual Report on Form 10-K for the fiscal year ended December 31, 2024. Identified material weaknesses include an inadequate internal control structure and oversight over financial reporting, specifically the lack of an independent Audit Committee and a sole director/executive officer before October 12, 2023. Another material weakness identified was the lack of appropriate information technology controls, including no formal procedure for data backup or off-site storage. The Board of Directors approved the appointment of Guangdong Prouden CPAs GP as the new independent registered public accounting firm for the fiscal year ending December 31, 2025, effective February 27, 2026. Neither the Company nor anyone on its behalf consulted with Guangdong Prouden regarding accounting principles or audit opinions prior to their appointment. Onestop Assurance PAC provided a letter to the SEC, dated February 28, 2026, agreeing with the Company's disclosures related to their firm in the Form 8-K.