[Amended] Decision to acquire shares/equity in another company (subsidiary)

What happened

CORRECTION NOTICE FOR DECISION ON ACQUISITION OF STOCKS AND INVESTMENT SECURITIES OF OTHER CORPORATIONS

Correction Date: 2026-09-18

1. Disclosure Document Subject to Correction Decision on Acquisition of Stocks and Investment Securities of Other Corporations

2. Submission Date of Disclosure Document Subject to Correction 2026-07-02

3. Reason for Correction Change in payment date

4. Corrected Items Item: Scheduled Acquisition Date Before Correction: 2026-11-21 After Correction: 2027-04-10

Before Correction (Strategy): 2) Third-party allotted paid-in capital increase (428,572 shares): Payment date September 21, 2026 (₩3,000,004,000) 3) Third-party allotted paid-in capital increase (571,427 shares): Payment date November 20, 2026 (₩3,999,989,000)

After Correction (Strategy): 2) Third-party allotted paid-in capital increase (428,572 shares): Payment date December 18, 2026 (₩3,000,004,000) 3) Third-party allotted paid-in capital increase (571,427 shares): Payment date April 9, 2027 (₩3,999,989,000)

DECISION ON ACQUISITION OF STOCKS AND INVESTMENT SECURITIES OF OTHER CORPORATIONS Major Management Matters Report of Subsidiary Appten Co., Ltd.

1. ISSUING COMPANY Company Name (Nationality): GPCR Co., Ltd. (Republic of Korea) Representative Director: Shin Dong-seung Capital (₩): 5,163,453,500 Relationship with Company: - Total Issued Shares: 10,326,907 shares Principal Business: New drug research and development using biotechnology techniques Acquisition of new shares by third-party allotment within the past 6 months: No

2. ACQUISITION DETAILS Number of Shares Acquired: 1,428,571 shares Acquisition Amount (₩): 9,999,997,000 Equity (₩): 95,184,341,639 Ratio to Equity (%): 10.51 Large Enterprise Status: Not applicable

3. SHAREHOLDING AND OWNERSHIP RATIO AFTER ACQUISITION Number of Shares Held: 1,428,571 shares Ownership Ratio (%): 12.15

4. ACQUISITION METHOD Cash acquisition (third-party allotted paid-in capital increase)

5. PURPOSE OF ACQUISITION Addition of new growth drivers through new business initiatives

6. SCHEDULED ACQUISITION DATE 2027-04-10

7. Major Asset Transfer Report Submission Status Not applicable Total Assets at End of Most Recent Fiscal Year (₩): - Acquisition Price / Total Assets (%): -

8. Reverse Listing Applicability Not applicable Plan for third-party allotted capital increase within the next 6 months: Yes

9. Compliance with Reverse Listing Requirements of Issuing Company (Other Corporation) No

10. Board Resolution Date (Decision Date) 2026-07-02 Attendance of Outside Directors: Attended (1), Did not attend (0) Attendance of Auditor (Audit Committee): Attended

11. Fair Trade Commission Reporting Status Not applicable

12. Put Option Contract Execution Status No Contract Details: -

13. OTHER MATTERS FOR REFERENCE IN INVESTMENT DECISIONS

- The capital and total issued shares of the issuing company in Section 1 above are based on the date of disclosure submission. - The equity in Section 2 (Acquisition Details) above is based on the consolidated financial statements as of the end of 2025. - The scheduled acquisition date in Section 6 above is the day following the payment date of the last third-party allotted paid-in capital increase among the following share acquisition schedule: 1) Third-party allotted paid-in capital increase (428,572 shares): Payment date July 20, 2026 (₩3,000,004,000) 2) Third-party allotted paid-in capital increase (428,572 shares): Payment date December 18, 2026 (₩3,000,004,000) 3) Third-party allotted paid-in capital increase (571,427 shares): Payment date April 9, 2027 (₩3,999,989,000)

- Upon completion of participation in this paid-in capital increase, the Company will become the largest shareholder holding 12.15% of the issuing company (GPCR Co., Ltd.). - The current year, prior year, and year before prior in the [Summary Financial Situation of Issuing Company] below are prepared based on the (consolidated) financial statements for 2025, 2024, and 2023, respectively. (2025 is prepared on an individual financial statement basis as there are no subsidiaries) - The financial information in [Matters Regarding the Counterparty] below is prepared on an individual financial statement basis as there are no subsidiaries in 2025.

SUMMARY FINANCIAL SITUATION OF ISSUING COMPANY (Unit: ₩ million)

Category | Current Year | Prior Year | Year Before Prior Total Assets | 4,099 | 8,633 | 16,083 Total Liabilities | 2,625 | 5,612 | 5,606 Total Equity | 1,474 | 3,021 | 10,477 Capital | 5,163 | 5,163 | 5,163 Revenue | 2,518 | 2,000 | 0 Net Income (Loss) for the Period | -1,499 | -8,910 | -8,645

MATTERS REGARDING THE COUNTERPARTY

1. PERSONAL INFORMATION

Basic Information: Name (Corporate Name): GPCR Co., Ltd. Nationality: Republic of Korea Address (Principal Place of Business) [up to eup/myeon/dong]: Seoul, Gwanak-gu, Nakseongdae-ro 38 (Bongcheon-dong) Date of Birth (Business Registration Number, etc.): 110111-5263019 Occupation (Business Description): New drug research and development using biotechnology techniques

Largest Shareholder, Representative Director, and Chief Executive Officer Status and Financial Situation (when counterparty is a corporation):

Category | Name | Number of Shares | Ownership Ratio (%) Largest Shareholder | Lee Jeong-gyu | 1,143,537 | 11.07 Representative Director | Shin Dong-seung | 1,075,000 | 10.41

Financial Information (Unit: ₩ million) Fiscal Year: 2025 Closing Date: December Total Assets: 4,099 Capital: 5,163 Total Liabilities: 2,625 Revenue: 2,518 Total Equity: 1,474 Net Income (Loss): -1,499 External Auditor: Daejoo Accounting Firm Business Suspension Status: No Audit Opinion: Appropriate Business Closure Status: No

2. RELATIONSHIP BETWEEN COMPANY AND COUNTERPARTY

1. Relationship between Company and Counterparty: -

2. Relationship between Company's Largest Shareholder, Officers and Counterparty: Name | Relationship with Counterparty | | |

3. TRANSACTION HISTORY FOR THE PAST 3 YEARS (excluding routine transactions)

Category | Transaction Details Current Year | Prior Year | Year Before Prior |