Korea Post issued a 500-won stamp on 4 November 2026 for the centenary of Hunmaengjeongeum, the Korean Braille system developed by Songam Park Du-seong. The design builds his portrait from dots and surrounds it with Korean characters and Braille forms.

The official listing records 450,000 stamps in 30,000 sheets. Designed by Jeong Eun-young, the 30 × 48 mm stamp uses four-colour lithography with foil and embossing. Perforation is 14 × 14⅛, and the printing entry names POSA and Brebner Print. The listing gives the sheet arrangement as 5 + 5×2.

Hunmaengjeongeum uses combinations of six dots to express consonants, vowels and numbers. Park began researching Korean Braille in 1920, working with students before promulgating the system on 4 November 1926. He subsequently used correspondence teaching and transcribed educational and literary material to extend access to reading.

An associated commemorative postmark depicts a hand embossing Braille. The official service period is 4–17 November at 186 post offices, including Seoul Central, with museum provisions also listed. A separate Park Du-seong exhibition mark was scheduled at Nam-Incheon on 3–4 November.