[2] During Yongin's Youth Music Contest, his last competition with the band, Park received several business cards from different entertainment agencies and decided to audition with the support of his parents.

[4] Every day, Park attended school in Yongin, commuted by bus to the agency located in Seoul to train, and returned home in the middle of the night.

[8] In October 2009, Park appeared in a second Mnet series, Empire Kids Returns, documenting the group's street performances across South Korea staged to prepare for their upcoming debut.

[10][better source needed] In 2011, Park began his theatrical career as a cast member alongside Super Junior's Ryeowook in the musical Temptation of Wolves.

[13] The following year, Park had a role in KBS2's drama special Sirius (2013), where he played the adolescent version of twin brothers with starkly contrasting personalities.

[17] Park gained wider recognition after joining Real Men in June 2013, where he was nicknamed "Baby Soldier" for his innocent, yet passionate image.

[21][22] In 2015, Park was part of the main cast in SBS's romance drama High Society where he played the role of a chaebol who falls for a part-timer at the gourmet supermarket he manages.

[27] And in December 2016, he starred in the historical drama Hwarang: The Poet Warrior Youth, playing the role of Sammaekjong, a young and distrustful king.

[28] In February 2017, Park starred in his first leading role in cable network JTBC's Strong Girl Bong-soon, playing the CEO of a game company, Ainsoft.

[43][44] Park had earlier revealed that he was inspired to join the Capital Defense Command after he received positive feedback for his shooting skills while training for the variety show Real Man.

[45] Following his military discharge in January 2021,[46] Park starred in the apocalyptic city thriller Happiness as Jung Yi-hyun, an intelligent and honest violent crimes detective alongside Han Hyo-joo.

[54] In February 2023, Park starred as Lee Hwan, a cursed crown prince, in the television series Our Blooming Youth opposite Jeon So-nee.