[2] Despite the Japanese ban, Koreans still practiced martial arts in secret, and Kim was able to study Judo at the Kodokan from 1931, earning a Black Belt five years later.
He wasn't involved in martial arts but remained good friends with a senior student from the Shudokan, Yoon Byung-In.
His U.S. students included Mitchell Bobrow, Richard Chun,[5] Albert Cheeks, Michael Warren, James K. Roberts Jr., John Critzos II, and George Thanos.
Five Grand Masters awarded Kim 10th dan black belt while in the hospital with liver cancer at the age of 73 and died on 16 September 1993.
Kim was held in high regard in the Martial Arts World, more than 650 people attended his funeral.