[7] Rebranding and re-debuting as both a solo singer and a rapper, Park has participated in the underground hip hop culture scene in South Korea, a rarity for both active and former K-Pop idols.

[14] Born in Edmonds, Washington, in the Seattle metropolitan area, Park showed great interest in hip hop music and breakdancing at a young age.

In 2004, Park's mother, seeing how her son spent more time breakdancing than studying, suggested he try out for a locally advertised talent audition, which was organized by South Korean conglomerate JYP Entertainment.

[19] Unbeknownst to Park, the success of his audition would eventually lead to him being officially contacted and selected by JYP Entertainment to be part of a Korean boy band as an idol.

[21] Park first appeared through Mnet's Hot Blood Men, a documentary-style reality program that showed the future members of One Day, split as idol groups 2AM and 2PM, in training.

[23] Aside from 2PM's music activities, Park created the song "Jeong" (정) with Yeeun of the Wonder Girls for the original soundtrack of the television drama Conspiracy in the Court, and featured on V.O.S's "To Luv...".

Park expressed deep remorse and shame over his forgotten words and issued an official apology, explained the unhappiness that he experienced during his early days as a trainee in an unfamiliar country where he lacked family, the ability to easily communicate, and an understanding of the culture.

At the Mnet Asian Music Awards, the group paid homage to him during their performance of "Again & Again" with a spotlight shown over his usual position in the dance formation and his lines left unsung.

[45] However, because the album had been in preparation since January and public opinion on 2PM had since changed, the fans decided it would be in the best interest to not release the CD, and instead, mailed 10–20 copies to Seattle, Park's hometown.

[51] He appeared with fellow Art of Movement members at an annual Korean-American festival event called Project Korea III: KSA Cinderella Story at Rutgers University, New Jersey, on April 3, along with Ailee and Clara C.[52] Videos of the event were uploaded onto internet portal sites, where footage of Park acting as an MC and dancing to Beyoncé's "Single Ladies (Put a Ring on It)" on stage drew much positive interest.

[6] "Park Jaebeom has returned" became the biggest headline in Korea that day, and "JayIsBack" shot up immediately on the trending topics on Twitter on June 18 at 9:30 AM GMT.

[66] Park released an EP titled Count on Me (믿어줄래; Revised Romanization: Mideojullae) containing three tracks, including a rearranged Korean version of "Nothin' on You", on July 13.

Without any promotion on music shows, more than 41,316 copies sold, and the EP placed at number 32 on Gaon's year end chart,[69] earning Park approximately 700 million.

On September 5, Park participated in the 3rd International Secret Agents Los Angeles concert held in Cerritos, California, together with well-known YouTube celebrities such as Ryan Higa, KevJumba, AJ Rafael, Alyssa Bernal, Far East Movement, and America's Best Dance Crew Season 5 champions, Poreotix.

[98] On October 29, Park delivered a performance to over 25,000 fans as he headlined the MTV EXIT (End Exploitation and Trafficking) Live in Manila Concert held at the SM Mall of Asia.

Park also performed his song "Carefree",[134] which was included on the New Breed Red Edition repackaged album, and also showed his self-choreographed dance break to "Dirty Bass" by Far East Movement featuring Tyga,[9] which he later shared on YouTube.

In a flying visit to Los Angeles, Jay Park made a last-minute appearance in a YouTube sketch by David So, which parodies Wong Fu Productions' The Last.

[145] Park was the host of the December 1 episode of Saturday Night Live Korea, garnering attention for his R-rated skits, acting, and a parody music video of Eminem's "Love the Way You Lie", bringing in the highest ratings of the season for the show.

[171] With features and production from many of his AOMG labelmates such as Simon Dominic and Gray, the album presented tributes to Michael Jackson and R&B throwback ballads in its 17 tracks.

Directed by the production company Tiger Cave, the music video starred 4Minute's HyunA and featured cameos from other Korean talents such as rappers Reddy and Ugly Duck, among others.

[176] Later that same month, it was announced that Park would be replacing Melanie C and Vanness Wu as one of the judges on the second season of Asia's Got Talent, alongside Anggun and David Foster.

[178] Currently, the label houses American and South Korean artists such as GroovyRoom, pH-1, Sik-K, Woogie, Phe Reds, Raz Simone, and Ted Park.

Named after the surprise nature of the duo's collaboration, This Wasn't Supposed to Happen marked Park's second release under Roc Nation, and was preceded by their single "K-Town".

[183] In the month after, Park collabed with Latin artist and fellow Roc Nation signee Mozart La Para for the single "Son Malas".

[193] He is influenced by the work of American artists he grew up listening to, such as Usher, Michael Jackson, Ne-Yo, Chris Brown, Ginuwine, Musiq Soulchild, Justin Timberlake, Eminem, Jay-Z, Nas, Tupac, Dr. Dre, and Canibus.

[200][201] He also cites Andrew Baterina from SoReal Cru; Movement Lifestyle's members Keone Madrid, Lyle Beniga, and Shaun Evaristo; Ian Eastwood; and Twitch.

The back of the T-shirt shows the names of his b-boy crews Art of Movement and Korean Assassins, and dance collaboration team, Project Prepix Asia.

[220] A behind the scenes video of Park performing an impromptu dance to "Gangnam Style" by Psy at a Googims photo shoot was uploaded to YouTube on September 2, 2012, capturing the public's attention for his unique take of the choreography.

[citation needed] On March 8, 2020, a police report was filed against Brian Ortega for allegedly slapping Park, who is a good friend of UFC featherweight fighter Chan Sung Jung (also known as "Korean Zombie"), and serves as his translator.

[226] On March 8, 2022, Park donated ₩50 million to the Hope Bridge Disaster Relief Association to help the victims of the massive wildfires that started in Uljin, Gyeongbuk, and also spread to Samcheok, Gangwon.