Treasury share disposal: results report

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Treasury share disposal: results report 6.2 Development Advance Solution Co., Ltd. Treasury share disposal: results report

To the Commissioner of the Financial Supervisory Service July 3, 2026

Company name: Development Advance Solution Co., Ltd. Representative Directors: Han Sang-won, Han Nam-cheol Head office address: 26-2 Dongnong-gil, Dong-myeon, Hwasun-gun, Jeollanam-do (Tel) 061-370-2114 (Website) http://www.dasco.kr Preparer: (Title) Head of Management Division (Name) Kim Taek-gwan (Tel) 061-370-2133

1. Name and address of the issuer (a) Name: Development Advance Solution Co., Ltd. (b) Address: 26-2 Dongnong-gil, Dong-myeon, Hwasun-gun, Jeollanam-do

2. Disposal report details (a) Date the material event report was filed: July 2, 2026 (b) Disposal period: from July 2, 2026 to July 2, 2026 (c) Type and number of shares reported for disposal: Common shares 540,000 shares

3. Disposal details (Unit: KRW thousand, shares) Date: July 2, 2026; Type: Common shares; Quantity ordered: -; Quantity disposed: 270,000; Disposal price per share: 3,755; Total disposal value: 1,013,850; Disposal counterparty: Hongin Co., Ltd.; Brokerage firm order quantity: -; Financial investment company unique number: - Date: July 2, 2026; Type: Common shares; Quantity ordered: -; Quantity disposed: 270,000; Disposal price per share: 3,755; Total disposal value: 1,013,850; Disposal counterparty: Gasco Co., Ltd.; Brokerage firm order quantity: -; Financial investment company unique number: - Total: Quantity ordered: -; Quantity disposed: 540,000; Disposal price per share: -; Total disposal value: 2,027,700; -; -; -

Note 1) The "disposal price per share" above is the closing price on the disposal date (July 2, 2026). Note 2) The disposal method was a transfer from the Company's treasury stock account to the counterparty's securities account. Note 3) The disposal counterparties are subject to Article 172 (Return of Short-Swing Profits by Insiders) of the Financial Investment Services and Capital Markets Act. Note 4) In the share transfer agreement with the counterparties, the Company agreed to restrict disposal of the shares for one year from the date of acquisition.

4. Whether the disposal report details match the actual disposal Planned shares for disposal (shares): Common shares 540,000, Other shares -; Total shares disposed (shares): Common shares 540,000, Other shares -; Match: Match; Reason for difference, if any: -

5. Holding status of treasury shares after disposal [As of July 3, 2026] (Unit: KRW million, shares, %) Share type: Common shares; Holdings under Article 165-3 of the Act (A): Quantity 1,365,188, Ratio 6.84%, Total value 5,104; Holdings under trust agreements etc. under Article 165-3 (B): Quantity -, Ratio -, Contract amount -; Total (A+B): Quantity 1,365,188, Ratio 6.84%, Amount 5,104 Total: Quantity 1,365,188, Ratio 6.84%, Total value 5,104; -; -; -; Quantity 1,365,188, Ratio 6.84%, Amount 5,104

Note 1) The "holdings under Article 165-3 of the Act (A)" above is the number of shares (1,365,188 shares) remaining after deducting the shares disposed of this time (540,000 shares) from the shares (1,905,188 shares) credited to the Company's securities account following the earlier termination of a trust agreement. Note 2) The total value above is based on book value, and the ratio is calculated against the total number of issued common shares of 19,948,221 shares.