From 2013.03.29 to 201?? (Still open)
To look back on the heroes of our time who inspire us to cheer excitedly and provide momentum to the happiness and richness of our lives, "The Memorable Figures Series Stamps" is launched. This “Memorable Figures Series Stamps” are issued in the form of non-denominated postage stamp called "Yeong-won (permanent or everlasting) stamp." This stamp may be used perpetually with a permanently fixed value as the postal charges for domestic letter post, on any future date when the stamp is actually used (out of the "postal charges for letter post," the "postal charges" applied on the standard mails which weigh from over 5g to under 25g) regardless of any hike in postal charges. Featured in the stamp is "영원우표 국제규격25g" meaning the "Yeong-won stamp, standard mail within Korea up to 25g".