2015: Pre-debut Jinjin was a trainee for 2 years in Fantagio before debuting with Astro. He was the 5th trainee to be officially introduced with the Fantagio iTeen Photo Test Cut. Before their debut, Jinjin along with the other 5 members of Astro had starred in a web-drama
To Be Continued.
2016–2021: Debut with Astro and solo activities Jinjin debuted as part of the 6-member boy group Astro on February 23, 2016. Their first EP
Spring Up has five songs including the title track "Hide & Seek". In November 2018, Jinjin was featured in tvN Asia's "Wok the World". Jinjin joined the cast in
Hong Kong. During Astro's "2nd ASTROAD To Seoul "Starlight"" concert which was last held on December 22–23, 2018, Jinjin performed "Mad Max" which he also composed. It was included in the DVD of the concert which was released in June 2019. Jinjin alongside fellow Astro member
MJ composed "Bloom", which is one of the side tracks in their first full album
All Light which was released on January 16, 2019. In March 2019, Jinjin and MJ took part in the travel variety show
Go Together, Travel Alone for Celuv TV. The show was filmed in
Saipan and includes
Tony Ahn,
Han Seung-yeon and
Kim So-hye. It was later on released in a DVD format. In July 2019, Jinjin and MJ competed in OGN's Game Dolympics. In May 2020, Jinjin composed one of the side tracks in their seventh EP
Gateway, titled "Lights On". In March 2021, Jinjin began hosting the Dive Studios podcast
Unboxing alongside
Pentagon's
Kino. In December 2021, Jinjin has been credited as a composer, lyricist and arranger of "Villain" — a single included in the first mini album for South Korean boy group Trendz. Fantagio also confirmed in December that Jinjin and bandmate Rocky will form Astro's second sub-unit called
Jinjin & Rocky. They will debut with the extended play
Restore on January 17, 2022.
2022–present: Sub-unit debut, solo activities, JIN LAB Project and Second sub-unit On January 17, 2022, Jinjin debuted as part of the duo
Jinjin & Rocky with the EP
Restore. On December 30, Fantagio released an official statement and stated that Jinjin had decided to renew his contract with the agency. On February 28, 2023, Rocky did not renew his contract and thus left Fantagio and Astro, thereby ending the duo sub-unit. On October 19, Jinjin released the project single 'Wave in my heart featuring
Yunhway, with KozyPop through various online music sites. On July 29, Fantagio announced that members MJ and Jinjin would form Astro's third sub-unit, Zoonizini. The duo released their debut extended play 'Dice' and its lead single "Some Things Never Change" on August 13, 2025. ==Personal life==