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postage
2014, Apr 9 Memorable Figures (2nd) issue unwmk (no perf info)
| - | 1234 | multi | Han Yongun | |||
| - | 1234 | multi | Lee Yuksa | |||
| - | 1234 | multi | Yun Dongju |
2015, Apr 10 Science in Korea (1st) issue
| - | 1234 | multi | Benjamin W. Lee | |||
| - | 1234 | multi | Seok Ju Myeong | |||
| - | 1234 | multi | Han Man Choon |
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