Green went into the final day with a two-shot advantage, but Boutier hit five birdies in her final seven holes to card a six-under 66 for an 18-under clubhouse lead at Seowon Valley Country Club.
Green's birdie on the 17th hole proved enough to clinch her third title of 2024, as she finished with a round of 71 and a 19-under total of 269.
"It helps that I've been hitting the ball well, and when the putter goes well, it does go well," said the 27-year-old.
"So just making sure that I can stay consistent.
"But I still have four or five more tournaments for the rest of the year, so I want to continue to work hard and have myself in these type of positions."
It was the sixth LPGA title for Green, who won a Major at the 2019 Women's PGA Championship.
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