[4] Jung had filled in for labelmate Yong Jun-hyung during some of G.NA's debut promotions with "I'll Back Off So You Can Live Better" on music shows, in 2010.

[citation needed] In 2011, Jung (along with four other members of BtoB's initial lineup) made his acting debut in the JTBC sitcom, I Live in Cheongdam Dong.

[6] After being active as main rapper and also produce songs for BTOB, he left the group on December 31, 2020, after being investigated by the Seoul Metropolitan Police Agency for using marijuana in prior years.

[7][full citation needed] Since 2012, Jung has been continuously appearing on variety show Weekly Idol as a special MC together with Apink's Bomi.

[2] Later that year, Cube Entertainment announced Hyuna's lead single for A+, titled "Roll Deep" (Because I'm the Best), would feature Jung.

He was only able to perform with Hyuna twice as there was a conflict with other BtoB schedules, and was replaced by Cube Entertainment's trainee, Kim Hyo-jong.

Later in 2015, Jung joined the line-up for Unpretty Rapstar 2's semi-finals episode as he performed with contestant Jiyoon for the track "This Ain't Me".

[17] In September 2017, it was announced Jung would be joining the cast of web-mockumentary (fashioned as a cosmetics reality program), The Cushion, alongside label mate Yoo Seon-ho and Korean beauty YouTuber Lena.

[25] On February 21, 2019, Jung dropped a digital single, "Spoiler", featuring solo artist Babylon.

[29] On December 21, 2020, it was reported that Jung was under investigation by the Seoul Metropolitan Police Agency along with accomplices for purchasing and using cannabis in prior years and that his case had already been handed to prosecution earlier in July.

[37] According to the prosecutor's statement, from July 5, 2016 to January 9, 2019, Jung with conspirators remitted 133 million KRW over 161 times, using cryptocurrency, and bought and inhaled 826 g and 20 ml of cannabis.

[45] At the decision hearing on the afternoon of May 20, 2021, the prosecutors sought a 4-year prison sentence and a 133.065 million KRW fine.

The content of the indictment was partially changed due to the difference in the number of actual purchases and smoking times and the legal misunderstanding about the fine.