The Republic of Korea shooter followed up a perfect score in qualifying with a superb performance in the final, scoring 10.8 with his opening shot to set the tone.
From there, he rarely looked troubled, clinching gold with a total of 705.5 - a final Paralympic record.
Gorazd Francek Tirsek had to rely on the help of a team-mate to clinch second place and silver via a shoot-off, with the Slovenian forced to borrow a rifle when his own malfunctioned.
He said: 'I feel great. I had the best cheers in the world. Emotions are amazing. It is actually the success of the whole team as Franc Pinter lent me his gun as mine was malfunctioning.'
He finished with the same final score as reigning world number one Michael Johnson of New Zealand but edged out his rival with a 10.8 shot in the shoot-off.