In-Bee played well on the Futures Tour. Although she did not win an event, she notched multiple top finishes and wound up in third place on the Futures Tour money list. Thus, she earned her exemption for the 2007 LPGA season.

In 2007, In-Bee started to spell her name Inbee, perhaps to make it easier to remember for fans. Her rookie year on tour was a rough struggle at first. Until June, she missed more cuts than she made, and her best finish was a tie for 45th. But all that changed at the US Women's Open. Perhaps remembering how well she had played USGA events as a junior, she did wonderfully there, eventually finishing tied for 4th, by far her best finish of the year. She played well at the British Open as well, just missing a top ten.

Her best result of her career came a few weeks later in Portland. She started the week all right, but on the final day caught fire, shooting a blistering 8 under par 64 that catapulted her all the way into the top five. By the end of the day, her rally was good enough for a tie for second. She finished the year in the top forty on the money list, securing a two year exempt card on tour and winding up fourth in the Rookie of the Year standings. All in all, it had been a wonderful year for her on tour.

If 2007 was a strong season for Inbee, 2008 was a historic one. She quickly notched three straight top tens, including one at the year's first Major, and continued her strong play thereafter. But it was at the US Women's Open that she became a star. The previous year, she had finished tied for 4th, and in 2008, she found herself contending for the title on Sunday. While all around her collapsed, she played brilliantly, eventually capturing the title by four shots. In winning this event, the biggest in all women's golf, she became the third Korean to collect that crown, and the youngest ever champion, beating the record previously held by her idol, Se Ri Pak. She revealed that she had taken up the game only two days after watching Se Ri win this very title in 1998; things had indeed come full circle for the Korean golf explosion.

Inbee struggled a bit after this win, but she still collected more than a million dollars in earnings in 2008. She also earned her first major sponsorship, with SK Telecom, as a direct result of her win. She returned home to Korea as a heroine just a few days after her amazing accomplishment.

Inbee's weird post-Open malaise continued in 2009. She finally started to show signs of life mid-year with a tie for 14th at the LPGA Championship and two other top 30s at the next two Majors. But it wasn't until the end of the year that she finally achieved her first top tens, two in a row to finish the year.

Inbee actually had her best 2009 result on the KLPGA. At the Nefs Masterpiece, she got into a playoff with Bo Mi Lee, but Lee prevailed on the second hole.

At the end of the year, Inbee entered Japanese LPGA Qualifying School. She succeeded in earning a card on the JLPGA, and played both tours in 2010. Indeed, Park's start on the JLPGA tour was nothing short of astonishing. She finished tied for 2nd with Jiyai Shin at her very first JLPGA event of the year, although she lost to another Korean rookie, Sun Ju Ahn, by five shots. In her second event, she actually had the top score at the end of the week, but then was assessed a two stroke penalty for not replacing her ball after it moved on a green. This downgraded her to another second. Shifting to America, she notched yet another 2nd at the Kia Classic, before returning to Japan to once again finish second, this time losing a playoff. She finally got her first win the week after that, but in her next event, she finished - second! All in all, it was a great year in Japan for Inbee. In limited action she notched two wins, her other win being the final event of the year, the Ricoh Cup, which was also a Major. In all, she had 10 top tens in 14 starts.

Her LPGA year was also very impressive. She shattered her record for most top tens in a year, collecting 11, including top tens in all four Majors. She did not win, but had a second (at the aforementioned Kia Classic), a third, and a fourth among those 11 top tens. She finished 11th on the money list, a fantastic return to form after struggling so much after her Open win.

2011 was not so good a season for Park, although she still finished 31st on the money list. On the LPGA tour, she had three top tens. Her best moment came at the Ricoh British Women's Open in August. She shot a second round 64 to move into a share of the lead. She was not able to hold on, however, finishing 7th in the end. She also had a tie for 6th at the US Women's Open, and made it to the round of 16 at the Sybase Match Play.

Inbee did better on the JLPGA in 2011, capturing a win at the Daikin Orchid Ladies Open, the first event of the season. She won by three strokes over Japanese star Miki Saiki, and was 4 ahead of Bo Mee Lee and Bo Bae Song.