Park debuted in 2005 with the TV series
Love Needs a Miracle and rose to stardom with her role as
Queen Inhyeon in MBC's 2010 historical drama
Dong Yi, followed by a comedic turn as a teacher in the popular sitcom
High Kick: Revenge of the Short Legged that aired in 2011–2012. Her visual and stylish outfits received praise, leading to her becoming a popular actress by the first half of 2012. She won the Best TV Entertainment Award at the
48th Baeksang Arts Awards. Park also has appeared in films such as
The Last Blossom (2011),
Champ (2011), and
Tone-deaf Clinic (2012). In 2013, she returned to dramas with
Ad Genius Lee Tae-baek on KBS and showcased her acting skills in the MBC drama
Two Weeks. She also made a cameo in episode 30 of
Potato Star 2013QR3. In 2014, she appeared in SBS dramas SBS dramas
Three Days and
Temptation. In January 2015, she participated in the
Real Men: Female Soldier Special - Season 2. In September 2016, she portrayed Park Ha-na in the
tvN drama
Drinking Solo. In July 2019, Park returned to acting as the lead role of Son Ji-eun in the Channel A drama
Love Affairs in the Afternoon. Despite some initial concerns about the material, her acting contributed to the highest viewership ratings in Channel A drama history. She expressed her deep affection for the project, considering it a significant achievement in her career. In December 2019, she was cast as the main character in the film
First Child. On June 29, 2020, Park Ha-sun appeared on KBS 9 o'clock News Anchor Invitation Seat. In November 2020, she starred in the tvN drama
Birthcare Center as Cho Eun-jeong, a seemingly perfect mother who breastfeeds twins for 24 months. Despite her image as a flawless parent, her life is far from perfect. Her portrayal earned her a nomination for Best Supporting Actress at the 57th Baeksang Arts Awards. In September 2021, she starred in the MBC drama
The Veil as Seo Soo-yeon, Ji-hyuk's colleague at the NIS and the head of the Criminal Information Integration Center. She was nominated for the Top Excellence Award for Actress in a Miniseries at the MBC Drama Awards. She later appeared in the spin-off titled
Moebius: The Veil, which received positive reviews for its excellent direction and strong acting. Many viewers believed that including "Moebius" in the original series would have provided a more comprehensive understanding of the characters' past and backgrounds. In March 2022, Park renewed her contract for the second time. In late February 2024, Park decided not to renew with
KeyEast. She then signed exclusive contract with Blitzway Entertainment. ==Personal life==