Material event report (decision to sell own convertible bonds)

What happened

Material Event Report (Decision to Sell Own Convertible Bonds) 6.0 Sonid Co., Ltd. [report caption as stated in the filing] JK Synapse Co., Ltd. Material Event Report / Korea Exchange Reporting Matter To the Financial Services Commission / Korea Exchange August 11, 2026 Company name: JK Synapse Co., Ltd. CEO: Hwang Kevin In-seok Head office address: 50 2-gongdan 7-gil, Seobuk-gu, Cheonan-si, Chungcheongnam-do (Chaam-dong) (Tel) 041-410-7777 (Website) http://www.jksynapse.co.kr Preparer: (Title) CEO (Name) Hwang Kevin In-seok (Tel) 041-410-7777

Decision to Sell Own Convertible Bonds

1. Bond type: Series 25, unregistered, interest-bearing, unsecured, privately placed convertible bonds 2. Bond issue date: September 13, 2023 3. Bond issuance method: Private placement 4. Bond maturity date: September 13, 2026 5. Face value (electronically registered) total of bonds (KRW): 20,000,000,000 6. Details of the bonds' prior redemption before maturity Face value (electronically registered) amount of bonds subject to resale (KRW): 5,536,000,000 Acquisition amount (KRW): 7,887,508,090 Acquisition background: Early redemption etc. by mutual agreement with the subscriber 7. Sale decision date: August 11, 2026 8. Sale amount Amount (KRW): 929,752,200 Basis for calculation: Determined through negotiation with the buyer, considering the current share-price situation and conversion-request activity on the bonds 9. (Expected) proceeds receipt date: August 11, 2026 10. Purpose of sale: Securing working capital etc. 11. Conversion details Conversion ratio (%): 100 Conversion price as of the report date (KRW/share): 968 Type of shares to be issued upon conversion: JK Synapse Co., Ltd. registered common shares Number of shares: 929,751 Ratio to total shares outstanding (%): 5.06 Conversion request period: from September 13, 2024 to August 13, 2026 12. Subject to Fair Trade Commission reporting: Not applicable

13. Other matters for investment decisions 1) Resale history of the Series 25 convertible bonds (self-held bonds resold; date, buyer, face value (KRW), resale amount (KRW)): 2024.09.30 AI Innovation Growth Fund No.1; 500,000,000; 500,000,000 2024.10.11 AI Innovation Growth Fund No.1; 250,000,000; 250,000,000 2024.10.14 AI Innovation Growth Fund No.1; 100,000,000; 100,000,000 2024.10.17 Park Se-ri; 300,000,000; 300,000,000 2024.10.18 AI Innovation Growth Fund No.1; 350,000,000; 350,000,000 2024.12.24 Wang Tae-uk; 200,000,000; 200,000,000 2024.12.24 Jeong Jeong-hui; 50,000,000; 50,000,000 2024.12.24 Park Mi-kyung; 50,000,000; 50,000,000 2025.02.13 Team Planning Co., Ltd.; 1,500,000,000; 1,500,000,000 2025.02.13 Human Hills Company Co., Ltd.; 1,500,000,000; 1,500,000,000 2025.02.14 Team Planning Co., Ltd.; 200,000,000; 200,000,000 2025.02.14 Liu Yun; 150,000,000; 150,000,000 2025.02.17 Team Planning Co., Ltd.; 1,000,000,000; 1,000,000,000 2025.02.17 Human Hills Company Co., Ltd.; 1,000,000,000; 1,000,000,000 2025.02.17 Ambition Co., Ltd.; 2,500,000,000; 2,500,000,000 2025.02.18 Shin Seung-su; 300,000,000; 300,000,000 2025.02.19 K Investment Association; 314,000,000; 314,701,260 2025.02.21 Kim Seong-uk; 2,500,000,000; 2,500,000,000 2025.02.21 Shin Seung-su; 100,000,000; 100,000,000 2025.03.10 Jeong Ju-hyeon; 1,600,000,000; 1,600,000,000 2025.03.10 Lee Chang-woo; 1,000,000,000; 1,000,000,000 2026.03.27 (expected completion 2026.08.26) Bae Jin-han and 5 others; 4,000,000,000; 4,400,000,000 2026.08.11 Kim Ki-un and 1 other; 900,000,000; 929,752,200 Total: 20,364,000,000; 20,794,453,460

2) Early (before-maturity) redemption history of the Series 25 convertible bonds (date; amount redeemed, KRW): 2024.09.25 1,500,000,000; 2024.12.06 1,500,000,000; 2025.01.06 500,000,000; 2025.01.24 8,000,000,000; 2025.02.13 8,500,000,000; 2025.04.08 350,000,000; 2025.06.27 250,000,000; 2025.07.31 50,000,000; 2025.12.05 350,000,000. Total: 21,000,000,000.

3) Registration-cancellation history of the Series 25 convertible bonds (date; amount cancelled, KRW): 2024.12.24 300,000,000; 2025.03.13 100,000,000; 2025.06.13 195,000,000; 2025.08.13 50,000,000. Total: 645,000,000.

4) The "conversion price," "shares to be issued," and "ratio to total shares outstanding" in item 11 above reflect the 100-won-to-500-won share consolidation effective June 23, 2026 and the conversion-price adjustment from the third-party-allotted rights offering paid in on July 28, 2026. 5) The "ratio to total shares outstanding" in item 11 is based on total shares including the current 14,359,271 shares already listed and 3,099,173 shares issued from conversion-right exercise on August 10, 2026.

[Buyers] (Buyer; Relationship to the company or largest shareholder; Selection background; Transactions/plans within 6 months before/after the sale decision; Face value of bonds purchased (KRW); Note) Kim Ki-un; -; selected considering the investor's intent, funding capacity and timing, to meet the company's management objectives and funding needs promptly; -; 700,000,000; - Yang Chae-ryeon; -; selected considering the investor's intent, funding capacity and timing, to meet the company's management objectives and funding needs promptly; -; 200,000,000; -