Kim was listed in the Guinness Book of World Records under "Highest intelligence quotient". The book gave the boy"s score as about 210. Guinness retired the "Highest intelligence quotient" category in 1990 after concluding intelligence quotient tests were too unreliable to designate a single record holder.
At age four he scored over 200 on an intelligence quotient test normally given to seven-year-olds.
An article was published about him in Look magazine. In February 1967 his father applied for Kim to be enrolled at Grant High School.
In November 2, 1967, at the age of 5, he appeared on Fuji television in Japan and amazed guests by solving Differential Equations. During that show, he wrote poems in different languages including English, Mandarin, Spanish, Vietnamese, Tagalog, Japanese and Korean.
On November 5, 1977, Kim solved complicated differential and integral calculus problems on Japanese television
Later on, he entered Chungbuk National University. He has majored in civil engineering and received a Doctor of Philosophy
As of 2007 he served as adjunct faculty at Chungbuk National University. In March 14, 2014, he became associate professor in Shinhan University, and became vice president of North Kyeong-gi Development Research Center.