Material event report (decision to redeem own convertible bonds early)

What happened

Material event report / Matters subject to KRX reporting obligation To the Financial Services Commission / Korea Exchange September 29, 2026 Company name: Telcon RF Pharmaceutical Co., Ltd. CEO: Kim Ji-hoon Head office address: 54 Gongse-ro, Giheung-gu, Yongin-si, Gyeonggi-do (Gomae-dong) (Phone) 031-371-8500 (Website) http://www.telcon.co.kr Preparer: (Title) Director (Name) Kwon Jung-gil (Phone) 02-515-8808

Decision to acquire own convertible bonds before maturity

1. Bond type: Tranche 23; unregistered (bearer) form, interest-bearing, unsecured, privately placed convertible bonds 2. Bond issue date: April 22, 2025 3. Bond issuance method: Private placement 4. Bond maturity date: April 22, 2028 5. Total face value (electronically registered) of the bonds (KRW): 12,000,000,000 6. Face value (electronically registered) amount of the bonds to be acquired (KRW): 2,700,000,000 7. Acquisition decision date: September 29, 2026 8. Acquisition amount - Amount (KRW): 2,810,132,348 - Basis for calculation: face value plus early-redemption interest; payment (expected) date September 29, 2026 - Source of acquisition funds: own funds 9. Method of acquisition: Over-the-counter purchase (early-redemption agreement) 10. Reason for acquisition before maturity: Early redemption by mutual agreement with the bondholders 11. Future handling plan: To be cancelled after acquisition 12. Matters concerning conversion - Conversion ratio (%): 100 - Conversion price as of the reporting date (KRW/share): 7,813 - Type of shares to be issued upon conversion: Telcon RF Pharmaceutical Co., Ltd. registered common shares - Number of shares: - - Ratio to total shares (%): - - Conversion request period: start April 22, 2026, end March 22, 2028 13. Remaining face value (electronically registered) of the bonds after acquisition (KRW): 6,300,000,000 14. Whether subject to Fair Trade Commission reporting: Not applicable 15. Other matters for reference in investment decisions 1) The above "7. Acquisition decision date" is the board resolution date. 2) The amount in "8. Acquisition amount" above includes principal and early-redemption interest; the payment (expected) date is the actual bond acquisition date. 3) The conversion price as of the reporting date in "12." above is as of September 29, 2026.

[Matters concerning the seller] Sangsangin Savings Bank: relationship with the Company or largest shareholder -; bondholder; transaction history and plans within 6 months before/after the acquisition decision: May 27, 2026 early redemption of Tranche 23 CB (face value KRW 1,750,000,000); face value of bonds sold (KRW): 1,575,000,000; note - Sangsangin Plus Savings Bank: relationship -; bondholder; transaction history: May 27, 2026 early redemption of Tranche 23 CB (face value KRW 1,250,000,000); face value of bonds sold (KRW): 1,125,000,000; note -

[Cases where the seller includes a corporation or entity] (1) Basic information on the entity - Sangsangin Savings Bank: number of investors 1; CEO Lee Jae-ok; largest shareholder: Sangsangin Co., Ltd. (100.00%) (2) Key financials for the most recent fiscal year (KRW million): fiscal year-end December 2025; total assets 2,006,872; revenue 304,218; total liabilities 1,779,537; net income 10,668; total equity 227,334; external auditor Samduk Accounting Corp.; capital stock 68,000; audit opinion Unqualified

(1) Basic information on the entity - Sangsangin Plus Savings Bank: number of investors 1; CEO Lee In-seop; largest shareholder: Sangsangin Co., Ltd. (100.00%) (2) Key financials for the most recent fiscal year (KRW million): fiscal year-end December 2025; total assets 1,259,952; revenue 164,040; total liabilities 1,163,103; net loss (8,525); total equity 96,848; external auditor Woori Accounting Corp.; capital stock 34,925; audit opinion Unqualified