He first gained recognition for appearing in the television series Hello Monster (2015) and thriller film Coin Locker Girl (2015) before coming to international prominence for playing a genius Go player in Reply 1988 (2015–2016) and a Joseon crown prince in Love in the Moonlight (2016).

He has since starred in the television series Encounter (2018) and Record of Youth (2020) as well as science fiction films Seo Bok (2021) and Wonderland (2024).

[5] During Park's sophomore year of high school he sent a video of himself singing and playing the piano to prominent talent management agencies which led to several offers.

[9][10] Despite his acting career, he maintained an active collegiate life and represented his university's cultural overseas exchange program in Europe.

[11] Park has also directed a one-act play based on Anton Chekov's works,[12] and served as music director in his graduating class's production of Hairspray.

[15][16] Park debuted as an actor under Sidus HQ, playing a supporting role in the thriller film Blind (2011).

[18] In 2013, he landed his first major role in the weekend drama Wonderful Mama playing the playboy son of Bae Jong-ok's character.

[66] On March 14, 2020, Park Bo-gum released official MV for the title track "Dear My Friend", from his first Japanese album, Blue Bird.

On March 18, 2020, Park released his first Japanese album, Blue Bird,[67] with 11 tracks including the single "Bloomin" from 2019.

[69] On June 16, 2020, Park Bo-gum's agency Blossom Entertainment revealed through Instagram that the actor will be releasing a new song produced by Sam Kim.

Singer-songwriter Sam Kim wrote the lyrics, composed, and produced "All My Love", and it is a song with a sentimental melody in which actor Park Bo-gum's uniquely sweet voice shines through.

[70] In 2021, Park starred in the science fiction thriller film Seo Bok in the title role, his return to the big screen in six years.

[71][72] Park reunited with the director and cast members of Love in the Moonlight in the travel entertainment program Young Actors' Retreat, which was released in September 2022 on TVING.

[75] He will star in the upcoming Netflix television series When Life Gives You Tangerines written by Lim Sang-choon and JTBC’s Good Boy in 2025.