Park is most known to the public as a parliamentarian for her work on reforming the judiciary system in the country, promoting its "fair economy" and uncovering misdemeanors of Lee Myung-bak administration.

[4] She was one of the vocal critics of South Korea's biggest chaebol, Samsung Group, and was particularly noted for her position on a controversial SDS transaction and the profits accumulated from a 1999 deal ruled by the courts as illegal.

[8] Poll in December 2020 shows that over 70% of mid-to-low ranking officer at her Ministry surveyed would like to continue to work with Park as she is poised to run for Seoul Mayor by-election in 2021.

[11] Her former colleague at Moon's administration, former ministers Park Yang-woo, Cho Myung-rae, Jeong Kyeong-doo and Kang Kyung-wha, joined her campaign as advisors.

[12][13] On 1 March 2021, Park earned party nomination for Seoul Mayor receiving nearly 70% of the votes cast, defeating the 4-term MP Woo Sang-ho.

Park was the front-runner to run against Oh Se-hoon from the main opposition party or Ahn Cheol-soo a former Seoul mayor candidate and a former presidential hopeful in the April by-election.