Kung completed her first LPGA title in five years at 6-under-par 210.
'It's been a long time and I'm just so happy to be back in that winning circle again,' said Kung, who earned $240,000 for the win. 'I've been pretty close a few times this year and just happy to be back and finally get a win before the season ends.'
Lee was joined at 4 under by Sophie Gustafson (70), Hee-Won Han (72) and Jeong Jang (71).
Second-round leader In-Kyung Kim stumbled to a 4-over 76 to end in a tie for 13th at 1 under.
Kung opened the final round with a 5-foot birdie putt on the first. She birdied the par-4 sixth for the third consecutive day to move to 5 under.
For the second straight round, Kung tripped to a bogey on No. 8 on the Ocean Course at Sky 72 Golf Club. She bounced back with a hole-out eagle on the par-5 ninth as she hole a lob-wedge from 76 yards.
Kung's eagle gave her the lead at 6 under. She parred the first six holes on the back nine to maintain the lead. She extended her lead with a 12-foot birdie putt on the par-5 16th.
However, Kung made things interesting with a three-putt bogey at No. 17. She closed with a par at the last and it was good enough for the win.
'I knew that I was going to hit good shots, every time I stood over the ball, I knew the ball was going to go where I'm looking at,' Kung stated. 'So I'm pretty confident over there and pretty much just played each shot by each shot, and it turned out well.'
Hull, who played one group ahead of Kung, parred all nine holes on the front side. She collected her first birdie at the par-4 10th.
The Australian jumped up the leaderboard with three birdies in a four-hole span from the 13th. Hull parred the final two holes to take second place.