(By the way, I've seen Chun's name spelled as "In Gee," "In-Gee" and "Ingee." Not really sure which is correct - guess we'll know soon enough if she wins the USWO.)
While Chun is a superstar in Asia, she's not yet well known in the United States - but she was ranked No. 20 in the world at the start of the USWO.
Chun is 20 years old (she turns 21 in August) and her rookie year on the KLPGA was 2013. That year she won the Korean Women's Open and finished second at that year's KLPGA Championship. She finished third on the money list and was second (to Hyo Joo Kim) in the KLPGA Rookie of the Year race.
She won three times in 2014 and was fourth on the KLPGA money list.
In 2015, In Gee won the World Ladies Championship Salonpas Cup. That's a Japan LPGA tournament, one of the JLPGA's majors. At 20 years old she became that tournament's youngest-ever winner. (It was also her first tournament in Japan.)