Wayne Homren's E-Sylum Newsletter last week cited a new web article on the 30th Anniversary of Liberation 100 Won commemorative coin: http://www.coinbooks.org/esylum_v18n24a29.html
There is plenty of information there, including the designers and engraver of this coin.
It seems that Jo Byung-soo did the obverse (Independence Arch), and Oh Dong-hwan did the reverse (woman with flag), while Kim Chan-sik (a Hongik University professor and sculptor) did the engraving.