Kim had stunned the crowd by defeating reigning champion Steeve Guenot of France in the semi-finals and he registered an impressive 1-0, 2-0 win over his opponent in tonight's 66kg medal showdown.
Kim only took up professional Wrestling two years ago but the 21-year-old won the Asian Championships on his debut and was in complete control of tonight's fight.
The Korean used all his strength to successfully defended a par terre in the first period and then lifted his opponent in the second to seal the win in front of a sell-out crowd.
He had to work hard to claim gold, though, after he suffered a blow to his right eye during his first fight against Hovhannes Varderesyan.
The problem worsened in each of his next five fights en route to glory, and by the time he had won the final, the eye was completely bruised over.
'I cannot see through one eye. I can't even open it,' the 21-year-old said. 'I did it in the elimination rounds and I got hit there again and again.
'It just kept swelling bit by bit and it was getting bigger and bigger but I just concentrated on my fights.
'There were no (Wrestling) medals for Korea in Beijing so I feel very happy to have won a gold here to revive Wrestling in Korea.'
The two bronze medals went to Georgia's Manuchar Tskhadaia and Guenot after they defeated German Frank Staebler and Pedro Mulens Herrera of Cuba in the finals of the repechage.