Updated terms.

Material Event Report (Paid-in Capital Increase Decision) 6.4 MSDI Co., Ltd. Correction Notice (Report) September 18, 2026

1. Original Disclosure Document Subject to Correction: Material Event Report (Paid-in Capital Increase Decision)

2. Original Submission Date of Disclosure Document Subject to Correction: May 12, 2026

3. Correction Details

Item | Reason for Correction | Before Correction | After Correction 9. Payment Date | Correction due to payment date change | September 18, 2026 | October 2, 2026 12. Scheduled Listing Date of New Shares | Correction due to payment date change | October 14, 2026 | October 22, 2026 20. Other Matters for Reference in Investment Decisions | Correction due to payment date change | Note 1) Note 2) | Note 1) 20. Other Matters for Reference in Investment Decisions (3) Matters Regarding Subscription and Allocation of New Shares - Subscription Date of New Shares: October 1, 2026 - Subscription Location: Finance Team, MSDI Co., Ltd., 114 Gwahak-sanup 1-ro, Oksan-myeon, Heungdeok-gu, Cheongju-si, Chungcheongbuk-do - Payment Date of Share Capital: October 22, 2026 - Payment Location: IBK Corporate Bank Ochang Branch | Note 2) 20. Other Matters for Reference in Investment Decisions (3) Matters Regarding Subscription and Allocation of New Shares - Subscription Date of New Shares: September 17, 2026 - Subscription Location: Finance Team, MSDI Co., Ltd., 114 Gwahak-sanup 1-ro, Oksan-myeon, Heungdeok-gu, Cheongju-si, Chungcheongbuk-do - Payment Date of Share Capital: September 18, 2026 - Payment Location: IBK Corporate Bank Ochang Branch

Material Event Report / Exchange Reporting Obligation Matter Financial Services Commission / Korea Exchange August 24, 2026

Company Name: MSDI Co., Ltd. Representative Director: Hwang Sung-hwan Head Office Address: 114 Gwahak-sanup 1-ro, Oksan-myeon, Heungdeok-gu, Cheongju-si, Chungcheongbuk-do Telephone: 043-218-7866 Website: http://www.msdi.kr Preparer: Director Park Jong-o, Telephone: 043-218-7481

Paid-in Capital Increase Decision

1. Type and Number of New Shares Common Stock (shares): 11,166,945 Other Stock (shares): -

2. Par Value per Share (KRW): 1,000

3. Total Issued Shares Before Capital Increase Common Stock (shares): 20,215,767 Other Stock (shares): -

4. Purpose of Capital Raising Facility Funds (KRW): - Business Acquisition Funds (KRW): - Operating Funds (KRW): 19,999,998,495 Debt Repayment Funds (KRW): - Securities Acquisition Funds of Other Corporations (KRW): - Other Funds (KRW): -

5. Capital Increase Method: Third-Party Allocation Capital Increase

※ Matters Regarding Other Stock Basis in Articles of Incorporation: - Content of Stock: - Other: -

6. Issuance Price of New Shares Common Stock (KRW): 1,791 Other Stock (KRW): -

7. Benchmark Stock Price Common Stock (KRW): 1,990 Other Stock (KRW): -

7-1. Calculation Method of Benchmark Stock Price: Minimum value of [simple average of weighted arithmetic mean stock prices over the past one month, one week, and most recent day, calculated from the day before the board resolution date, and the most recent day weighted arithmetic mean stock price]

7-2. Discount Rate or Premium Rate for Benchmark Stock Price (%): -10

7-3. Basis for Calculation of Discount Rate (Premium Rate): In accordance with Article 5-18 of the Regulations on Issuance and Disclosure of Securities, for third-party allocation capital increases, the issuance price may be calculated by setting a discount rate of up to 10% from the benchmark stock price. A 10% discount rate was applied by board resolution.

8. Articles of Incorporation Basis for Third-Party Allocation: Article 10 (Right to Subscribe for New Shares) of the Company's Articles of Incorporation

9. Payment Date: October 2, 2026

10. Dividend Base Date of New Shares: January 1, 2026

11. Scheduled Date of Delivery of New Share Certificates: -

12. Scheduled Listing Date of New Shares: October 22, 2026

13. Whether Reverse Listing Due to In-Kind Contribution: No Whether In-Kind Contribution Exists: No Whether Non-Listed Company Stock Exists Among In-Kind Contribution Assets: Not Applicable In-Kind Contribution Value of Shares to Be Paid (KRW): - Ratio to Total Assets of the Company's Most Recent Fiscal Year (%): - Number of Shares to Be Paid: -

14. Compliance with Reverse Listing Requirements: Not Applicable

15. Board Resolution Date (Decision Date): May 12, 2026 Independent (Outside) Director Attendance: Attended (persons): 2, Did Not Attend (persons): 0 Auditor (Audit Committee) Attendance: Attended

16. Whether Subject to Securities Registration Statement Submission: No

17. Reason for Exemption if Exempted: Exemption (Full Amount Lock-up for One Year)

18. Whether Applicable to Short Selling Transaction Period During Which Subscription is Prohibited: No Start Date: - End Date: -

19. Whether Subject to Fair Trade Commission Reporting: Not Applicable

* Listed companies: Independent Directors; Non-listed companies: Outside Directors

20. Other Matters for Reference in Investment Decisions

(1) Basis for Calculation of Issuance Price of New Shares In accordance with the regulations, the benchmark stock price was determined by calculating the simple average of the weighted arithmetic mean stock prices over the past one month, one week, and most recent day (calculated from the day before the board resolution date) and the most recent day weighted arithmetic mean stock price, and selecting the lower of the two. A 10% discount rate was applied to this benchmark stock price. Amounts less than one won were rounded up.

▶ When using the minimum value [simple average of weighted arithmetic mean stock prices over the past one month, one week, and most recent day, calculated from the day before the board resolution date, and the most recent day weighted arithmetic mean stock price] as the benchmark stock price, the following table is added:

(Unit: shares, KRW)

Category | Trading Volume | Trading Value | Weighted Arithmetic Mean Stock Price Weighted Arithmetic Mean Stock Price for Past One Month (A) | 3,566,347 | 8,256,503,495 | 2,315.12 Weighted Arithmetic Mean Stock Price for Past One Week (B) | 451,704 | 937,237,883 | 2,074.89 Most Recent Day Weighted Arithmetic Mean Stock Price (C) | 132,502 | 263,557,291 | 1,989.08 Simple Arithmetic Mean Stock Price of (A), (B), (C) (D) |, |, | 2,124.38 Benchmark Stock Price: Lower of (C) and (D) |, |, | 1,990 Discount Rate or Premium Rate (%) |, |, | -10 Issuance Price |, |, | 1,791

(3) Matters Regarding Subscription and Allocation of New Shares Subscription Date of New Shares: October 1, 2026 Subscription Location: Finance Team, MSDI Co., Ltd., 114 Gwahak-sanup 1-ro, Oksan-myeon, Heungdeok-gu, Cheongju-si, Chungcheongbuk-do Payment Date of Share Capital: October 2, 2026 Payment Location: IBK Corporate Bank Ochang Branch

(4) Matters Regarding Lock-up The new shares issued through this capital increase shall be deposited with the Korea Securities Depository in compliance with transfer restriction measures, and the withdrawal or sale of such securities shall be restricted for one year from the deposit date (including forward contracts for trading).

(5) Other Matters Subscription earnest money shall be replaced with share capital payment on the payment date, and no interest shall be paid on subscription earnest money. All matters related to this capital increase, including the above key schedule, may be changed depending on progress through consultation with relevant authorities or the third-party allocation recipients. Detailed matters regarding this capital increase are delegated to the representative director or a person designated by the representative director.

【Basis, Purpose, etc. of Third-Party Allocation】

Articles of Incorporation Provision Serving as Basis for Third-Party Allocation: Article 10 (Right to Subscribe for New Shares)

Purpose of Third-Party Allocation Capital Increase: 1. Shareholders of the Company have the right to receive allocation of new shares in proportion to the shares they own in the issuance of new shares. 2. Notwithstanding the preceding paragraph, in the following cases, the board of directors may allocate new shares to persons other than shareholders: ⑤ In cases where new shares are issued to domestic and foreign financial institutions, institutional investors, or counterparties for achieving business purposes in cases where it is necessary for the company's management, such as improvement of financial structure, business diversification, and fund raising.

To achieve the company's management objectives such as securing new growth engines and improving financial structure.

【Specific Use Purpose of Funds Raised Through Third-Party Allocation】

【In Case of Operating Funds and Other Funds】 (Unit: Million KRW)

Fund Use | Details | Planned Use Amount by Year | Total | | 2026 | 2027 | 2028 and Later | Operating Funds | Improvement of Financial Structure and Discovery of New Growth Engines, etc. | 10,000 | 5,000 | 5,000 | 20,000

【Selection Process, Transaction Details, Allocation Details, etc. by Third-Party Allocation Recipient】

Third-Party Allocation Recipient | Relationship with Company or Major Shareholder | Selection Process | Transaction Details and Plans Within 6 Months Before and After Capital Increase Decision | Number of Allocated Shares (shares) | Remarks NexOne Fund No. 1 |, | Selected by the board of directors in consideration of achievement of business and management objectives, investor's intention, payment capacity, timing, etc. |, | 11,166,945 | Transfer Restriction Measure (Full Amount Lock-up for One Year)

【In Case Law Firm or Organization is Included Among Third-Party Allocation Recipients】

(1) Basic Information of Law Firm or Organization

Name | Number of Contributors (persons) | Representative Director (Representative Combination Member) | Business Executive (Business Executive Combination Member) | Major Shareholder (Major Contributor) | | Name | Equity (%) | Name | Equity (%) | Name | Equity (%) NexOne Fund No. 1 | 2 | GMI Venture Co., Ltd. | 50 | GMI Venture Co., Ltd. | 50 | Kim Sang-heon | 50 |, |, |, |, |, |

(2) Key Financial Information at Most Recent Settlement Date of Law Firm or Organization (Unit: Million KRW)

Fiscal Year |, | Settlement Date | 12 | Total Assets |, | Sales |, | Total Liabilities |, | Net Income for the Period |, | Total Capital |, | External Auditor |, | Capital |, | Audit Opinion |

Fund Raising Method: Contributor Contribution Formation Background: Acquisition of Stocks of Other Corporations Purpose: Formation *This is a combination established in 2026.

【In Case Material Event Report is Corrected Five or More Times as Third-Party Allocation】

Reason for Correction: Correction due to change of recipient

Future Plan: The company will make every effort to proceed according to the future schedule.