[Amended] Material event report (convertible bonds)

What happened

Material Event Report (Decision to Issue Convertible Bonds) 6.3, Daejin Advanced Materials Co., Ltd.

Amendment Report (Filing) Date: 2026-07-14

1. Disclosure document subject to amendment: Material Event Report (Decision to Issue Convertible Bonds) 2. Date the original disclosure document was first filed: 2025-12-19 3. Amended items: Item: All items Reason for amendment: Withdrawal due to the designated subscriber's failure to fulfill its payment obligation Before amendment: None (-) After amendment: Withdrawal of the decision to issue the convertible bonds

To: Financial Services Commission / Korea Exchange, Material Event Report / Exchange Disclosure Obligation Matter Date: 2026-07-14 Company name: Daejin Advanced Materials Co., Ltd. Representative Director: Yoo Seong-jun Head office address: 4F, 342 Olympic-ro, Songpa-gu, Seoul Telephone: 02-412-7001 Website: http://www.daejin2019.com/ Person responsible for preparation: (Title) Managing Director; (Name) Kim Seong-kwon; (Telephone) 02-412-7001

Decision to Issue Convertible Bonds

1. Type of bonds, Series: 10; Type: Unregistered, coupon-bearing, unsecured, privately placed convertible bonds 2. Total face value (electronically registered) of the bonds (KRW): None (-) 2-1. Remaining issuance limit under the articles of incorporation (KRW): None (-) 2-2. (Overseas issuance) Total face value (electronically registered) (currency unit): None (-); Reference exchange rate, etc.: None (-); Place of issuance: None (-); Name of the market if listed overseas: None (-) 3. Purpose of fund raising, Facility funds (KRW): None (-); Funds for business acquisition (KRW): None (-); Operating funds (KRW): None (-); Debt repayment funds (KRW): None (-); Funds to acquire securities of other companies (KRW): None (-); Other funds (KRW): None (-) 4. Interest rate of the bonds, Coupon rate (%): None (-); Maturity interest rate (%): None (-) 5. Bond maturity date: None (-) 6. Method of interest payment: None (-) 7. Method of principal repayment: None (-) 8. Method of bond issuance: Private placement 9. Matters concerning conversion, Conversion ratio (%): None (-); Conversion price (KRW/share): None (-); Method of determining the conversion price: None (-); Type of shares to be issued upon conversion: None (-); Number of shares: None (-); Ratio to total shares outstanding (%): None (-); Conversion request period, Start date: None (-); End date: None (-); Matters concerning adjustment of the conversion price: None (-); Minimum adjusted price for downward conversion-price adjustment due to market price decline (KRW): None (-); Basis for the minimum adjusted price: None (-); Remaining issuance limit that may be adjusted below 70% of the conversion price at the time of issuance (KRW): None (-) 9-1. Matters concerning options: None (-) 10. Matters related to merger: None (-) 11. Subscription date: None (-) 12. Payment date: None (-) 13. Method of payment: Cash 14. Lead underwriter: None (-) 15. Guarantee institution: None (-) 16. Matters concerning the provision of collateral: None (-) 17. Date of board resolution (decision date): None (-); Attendance of outside directors, Present (persons): None (-); Absent (persons): None (-); Attendance of the auditor (audit committee member): None (-) 18. Whether subject to filing a securities registration statement: No 19. If exempted from filing, the reason: None (-) 20. Whether this convertible bond falls within a period during which short-sale transactions in its acquisition are prohibited: No; Start date: None (-); End date: None (-) 21. Details of any loan transaction linked to the overseas issuance of these bonds: None (-) (purpose, number of shares, identity of the lender and borrower, planned disposal timing, loan terms (period, repayment terms, interest rate), repayment method, connection with the issuance of these convertible bonds, fees, etc.) 22. Whether subject to filing with the Korea Fair Trade Commission: Not applicable 23. Other matters relevant to investment decisions:

[Bond issuance details by designated subscriber] Name of subscriber: None (-); Relationship with the company or largest shareholder: None (-); Background of selection: None (-); Transaction history and plans within 6 months before and after the issuance decision: None (-); Total face value (electronically registered) issued (KRW): None (-); Note: None (-)

[Specific purpose of use of the funds raised] [In the case of operating funds / other funds] (Unit: KRW million) Use of funds: Operating funds; Detailed breakdown: None (-); Planned amount of use by year ('xx, 'xx, 'xx): None (-); Total: None (-) * The detailed breakdown of operating/other funds should be stated specifically with reference to the following wording. (Example) "Investment in R&D expenses (labor costs, material costs) for the development of □□□ process technology."

[Matters concerning outstanding unredeemed bonds convertible into shares] Type of previously issued, unredeemed bonds / Outstanding balance (KRW) / Conversion (exercise) price (KRW) / Number of shares convertible (exercisable) (shares) / Conversion (exercise) period / Note: - Series 1 private convertible bonds: 2,000,000,000 / 6,300 / 317,460 / 2025-04-15 to 2029-04-13 / None (-) - Series 2 private convertible bonds: 1,000,000,000 / 6,300 / 158,730 / 2025-05-07 to 2029-05-05 / None (-) - Series 3 private convertible bonds: 1,000,000,000 / 6,300 / 158,730 / 2025-05-10 to 2029-05-08 / None (-) - Series 4 private convertible bonds: 2,000,000,000 / 6,300 / 317,460 / 2025-05-30 to 2029-05-28 / None (-) - Series 5 private convertible bonds: 2,000,000,000 / 6,300 / 317,460 / 2025-06-18 to 2029-06-17 / None (-) - Series 6 private convertible bonds: 1,000,000,000 / 6,300 / 158,730 / 2025-06-14 to 2029-06-13 / None (-) - Series 8 private convertible bonds: 6,500,000,000 / 9,349 / 695,261 / 2026-08-14 to 2028-07-14 / None (-) - Series 9 private convertible bonds: 9,300,000,000 / 9,349 / 994,758 / 2026-08-14 to 2028-07-14 / None (-) - Subtotal: 24,800,000,000 /, / (A) 3,118,589 /, / - Newly issued bonds: /, / (B) None (-) /, / - Total: 24,800,000,000 /, / 3,118,589 /, / Total number of shares already issued (shares) (C): 17,850,820 Ratio to total shares already issued (%) (D=(A+B)/C): 17.47