Kim Hak-su

(b. 1956) Korean pro 7 dan, also has played in the USA.

Also:

(b. 1939, d. 2021) Korean pro, 5 dan in 1995, retired in 2014.

References:

• https://ko.wikipedia.org/wiki/%EA%B9%80%ED%95%99%EC%88%98_(1939%EB%85%84)