[1] He is the leader of South Korean boy group Astro and former member of its sub unit Jinjin & Rocky under the label Fantagio.

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.

[7] 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.

[12] 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.

[15][full citation needed] On December 30, Fantagio released an official statement and stated that Jinjin had decided to renew his contract with the agency.

[17][full citation needed] On October 19, Jinjin released the project single 'Wave in my heart featuring Yunhway, with KozyPop through various online music sites.

[18][full citation needed] On March 20, 2024, Jinjin released the first new song of "JIN LAB Project" titled 'Good Enough' through various online music sites.

[19][full citation needed] On April 19, Jinjin released new digital single 'Fly' Duet with Moonbin through various online music websites.