Kim In became a professional in 1958 when he was 15. He was a student at the legendary Minoru Kitani school in 1962 and left to return home a year later. He was promoted to 9 dan in 1983, and was the third ever 9 dan in Korea. He was famous for his playing in the 60's and 70's. Currently he is the managing director for the Hanguk Kiwon.