Chang began the day two shots adrift of Kim and went on to card one-under 70 to join his compatriot, who managed a battling 72, on 277 after 72 holes.
Chang then parred the 16th, birdied the 17th and double bogeyed the 18th for a cumulative score of 12 at the Woo Jeong Hills Country Club.
Kim matched Chang's par on the 16th but bogeyed the next and double bogeyed the 18th for a total of 15.
"I made a mistake at the 14th hole that led to a double bogey. However, I thought that there were many holes left, and I tried to think as positively as possible," said Chang.
"It's great to get the win."
Last year's runner-up Choi Jinho, who carded the day's best score of 65, shared third place with Hur Inhoi (69) after totalling 278 in the third event on OneAsia's schedule this year.
(Reporting by Amlan Chakraborty in New Delhi; Editing by Clare Fallon)
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