Kim Sung-Jun (Korean: 김성준; Hanja: 金性俊; June 3, 1953 – February 3, 1989) was a boxer from South Korea.
In January, 1978, he won the Orient and Pacific Boxing Federation light flyweight title.
In September, 1978, Kim became the WBC light flyweight champion with a KO win over Netrnoi Sor Vorasingh.
[2] In July, 1980, Kim unsuccessfully challenged Shoji Oguma for the WBC flyweight title, losing by a split decision.
After retiring, Kim experienced dementia pugilistica and financial difficulties, and on February 3, 1989, he committed suicide by leaping off a building in Seoul, South Korea.