[Amended] Material event report (equity acquisition)

What happened

Decision to acquire shares and equity securities of another company 6.1 KG Dongbusteel

Amendment report July 31, 2026

1. Disclosure document being amended: Material event report (decision to acquire shares and equity securities of another company) 2. Date the original disclosure document was first filed: March 31, 2026 3. Amended items Item: [Matters concerning borrowings] -- Reason for amendment: Addition of borrowing details -- Before amendment: - (Note 1) -- After amendment: (Note 1) Addition of matters concerning borrowings

[Matters concerning borrowings] (Unit: KRW millions) Lender: KB Securities Co., Ltd.; Loan amount: 67,000; Loan period: 5 years from the initial drawdown date; Collateral assets: -; Note: Share pledge agreement covering 19,225,720 common shares of K Car among the pledged shares; securities-account pledge agreement over the account holding the pledged K Car shares; deposit-account pledge agreement over the Company's deposit account receiving dividends, share disposal proceeds, and other contractual receipts Lender: KDB Capital Corporation; Loan amount: 26,000; Loan period: 5 years from the initial drawdown date; Collateral assets: -; Note: same pledge arrangements as above Lender: SBI Savings Bank Co., Ltd.; Loan amount: 7,000; Loan period: 5 years from the initial drawdown date; Collateral assets: -; Note: same pledge arrangements as above Subtotal: 100,000; -; -; - The above matters are expected to proceed on the premise that all conditions precedent to closing under the share purchase agreement (including the business combination filing) are satisfied.

[Full text of the material event report] Material event report / Matter subject to exchange reporting obligation To: Financial Services Commission / Korea Exchange March 31, 2026 Company name: KG Steel Co., Ltd. Representative director: Kim Seong-il Head office address: 5th floor, KG Tower, 92 Tongil-ro, Jung-gu, Seoul (Phone) 02-3450-8114 (Website) https://kg-steel.co.kr Person responsible for preparation: (Title) Head of Finance Office, Management Support Division; (Name) Kim Hyeong-do; (Phone) 02-3450-8095

Decision to acquire shares and equity securities of another company

1. Issuing company Company name: K Car Co., Ltd. Nationality: Republic of Korea Representative: Jeong In-guk Capital (KRW): 24,410,424,000 Relationship with the Company: - Total shares issued: 48,820,848 Main business: Used car sales Whether new shares were acquired via third-party allotment within the last 6 months: No

2. Acquisition details Number of shares acquired: 25,632,810 Acquisition amount (KRW) (A): 400,000,000,050 Total assets (KRW) (B): 3,100,740,293,377 Ratio to total assets (%) (A/B): 12.90 Equity capital (KRW) (C): 2,055,486,553,860 Ratio to equity capital (%) (A/C): 19.46

3. Number of shares held and ownership ratio after acquisition Shares held: 25,632,810 Ownership ratio (%): 52.50

4. Purpose of acquisition: Diversifying the business portfolio and securing future growth drivers

5. Expected acquisition date: -

6. Counterparty Company name: Hahn & Co. Auto Service Holdings LLC Capital (KRW): 3,436,512,200 Main business: Investment-purpose company under the Financial Investment Services and Capital Markets Act Head office address: 19 Eulji-ro 5-gil, 21F (Suha-dong, Ferrum Tower), Jung-gu, Seoul Relationship with the Company: -

7. Payment of transaction consideration 1) Payment method: Cash payment 2) Payment timing: Deposit: April 1, 2026; Balance: on the premise that all conditions precedent to closing under the share purchase agreement are satisfied, the date falling 5 business days after such conditions are satisfied, or such other date as the parties otherwise agree

8. Matters concerning external valuation Whether there was an external valuation: Yes Basis and reason: 1) Basis: Prepared for use as an attachment to the material event report submitted to the Financial Services Commission under Article 161 of the Financial Investment Services and Capital Markets Act and Article 171 of its Enforcement Decree. 2) Reason: To provide reference material for assessing the appropriateness of the acquisition price, and for use as an attachment to the material event report the Company submits under the Financial Investment Services and Capital Markets Act Name of external valuation institution: Taesung Accounting Corporation External valuation period: 2026.06.17 - 2026.06.26 External valuation opinion: According to the valuer's review, the per-share reference market price of the shares to be acquired is KRW 14,115, and the per-share value applying a control premium is calculated to range from a minimum of KRW 12,780 to a maximum of KRW 32,482. Since the Company's acquisition price of KRW 15,605 per share falls within this range reflecting the control premium, no basis was found to conclude the acquisition amount is inappropriate from a materiality perspective.

9. Board resolution date (decision date): 2026.06.29 Independent (outside) director* attendance: Present (number): 3; Absent (number): 1 Attendance of statutory auditor (audit committee member who is not an independent (outside) director*): -

10. Whether this constitutes a backdoor listing: Not applicable Plans for a third-party-allotted capital increase, etc. within the next 6 months: Not applicable

11. Whether the issuing company (the other company) meets the requirements for a backdoor listing: Not applicable

12. Whether subject to Fair Trade Commission reporting: Applicable

13. Whether a put option or similar contract was entered into: No Contract details: -

* Applies to independent directors for listed companies and outside directors for unlisted companies

14. Future plans for corporate restructuring As of the report filing date, no specific plans for future restructuring have been determined.

15. Other matters for reference in investment decisions The capital and total shares issued of "1. Issuing company" above are as of the disclosure filing date. The total assets and equity capital in "2. Acquisition details" above are stated based on the consolidated financial statements prepared under Korea-adopted International Financial Reporting Standards as of the end of 2025. The "5. Expected acquisition date" above is based on the date payment is completed. Following this acquisition decision, the Company executed a share purchase agreement with the counterparty on the same day as the board decision; however, the balance of the acquisition price is expected to be paid on the premise that all conditions precedent to closing (including the business combination filing) are satisfied, on the date falling 5 business days after such conditions are satisfied or such other date as the parties otherwise agree, and the Company will promptly file an amendment disclosure once the payment date is finalized. The capital of the counterparty in "6. Counterparty" above is based on preliminary (unaudited) figures as of the end of 2025. The payment timing in "7. Payment of transaction consideration" above reflects that the deposit was paid in full on April 1. Regarding "8. Matters concerning external valuation" above, the acquisition will proceed through an on-exchange purchase method if such a method is available. The "12. Whether subject to Fair Trade Commission reporting" above refers to the business combination filing. All authority for determining detailed matters and specific implementation has been delegated to the representative director or a person designated by the representative director. In this transaction, either the seller or the buyer may immediately terminate the agreement by written notice to the other party if closing of the transaction becomes illegal or prohibited under applicable law, or if a government authority issues an order making the transaction illegal or prohibited and such order becomes final and non-appealable. The issuing company's financial information is stated as of the end of the current year (2025), the prior year (2024), and the year before the prior year (2023).

Related disclosures: -

[Summary financial status of the issuing company] (Unit: KRW millions) Category / Total assets / Total liabilities / Total equity / Capital / Revenue / Net income / Audit opinion / External auditor Current year: 534,570 / 310,632 / 223,939 / 24,410 / 2,438,839 / 50,886 / Appropriate / Samil PricewaterhouseCoopers Prior year: 524,848 / 299,060 / 225,788 / 24,091 / 2,301,530 / 43,965 / Appropriate / Samil PricewaterhouseCoopers Year before prior year: 554,118 / 319,202 / 234,916 / 24,091 / 2,047,566 / 28,366 / Appropriate / Samil PricewaterhouseCoopers

[Matters concerning borrowings] (Unit: KRW millions) Lender: KB Securities Co., Ltd.; Loan amount: 67,000; Loan period: 5 years from the initial drawdown date; Collateral assets: -; Note: Share pledge agreement covering 19,225,720 common shares of K Car among the pledged shares; securities-account pledge agreement over the account holding the pledged K Car shares; deposit-account pledge agreement over the Company's deposit account receiving dividends, share disposal proceeds, and other contractual receipts Lender: KDB Capital Corporation; Loan amount: 26,000; Loan period: 5 years from the initial drawdown date; Collateral assets: -; Note: same pledge arrangements as above Lender: SBI Savings Bank Co., Ltd.; Loan amount: 7,000; Loan period: 5 years from the initial drawdown date; Collateral assets: -; Note: same pledge arrangements as above Subtotal: 100,000; -; -; - The above matters are expected to proceed on the premise that all conditions precedent to closing under the share purchase agreement (including the business combination filing) are satisfied.