In 2013, he was street-casted by SM Entertainment‘s staff when he was working at a volunteering event.
In 2014, he participated with other SMROOKIES members on the show Exo 90:2014, where they performed songs from the 90s. He was featured in many SMROOKIES event such as the Rookies Station, & SMTOWN Live World Tour IV, before he was introduced on April 22, 2015.
He was then featured as a member on the Disney Channel Korea show The Mickey Mouse Club with fellow SMROOKIES members, the show aired from July 23 to December 17, 2015.
2016–2017: NCT Dream and hiatus
Jaemin was introduced as the final member of the third sub-unit of NCT, NCT Dream, on August 22, 2016. He officially debuted with the group on August 25, 2016, with the single "Chewing Gum". He was unable to attend the 2016 MAMA with the group and went on a hiatus as he was receiving treatment for his herniated disc.
2018–present: NCT 2018
On February 2, 2018, a promotional picture of Jaemin was shared on NCT's Instagram account for the album NCT 2018 Empathy. This was to be Jaemin's first release since his debut with NCT Dream in August of 2016.
|2018||NCT Dream||"Dear Dream"||We Go Up||Writing|
|"Bye My First.."|
|2020||NCT Dream||"Puzzle Piece"||Reload||Writing|
- Exo 90:2014 (Mnet, 2014) - guest (with SMROOKIES)
- A-TEEN (Naver TV Cast, 2018) - cameo (with Jeno)
- The Way I Hate You (JTBC, 2019)
- The Mickey Mouse Club (Disney Channel Korea, 2015) - Mouseketeer
- My 100 Hours Puberty (tvN, 2018-2019)
- Shall We Play Together? GG! (Channel A, 2019)
- Main article: Jaemin (NCT)/Gallery
- Soompi: SM Rookies to Star In Variety Show “The Mickey Mouse Club”; Hosted by Super Junior’s Leeteuk
- Soompi: Update: NCT Reveals Final Member Of NCT DREAM
- Soompi: NCT DREAM’s Jaemin To Be Absent From 2016 MAMA Due To Health Issue
- Soompi: NCT Dream’s Jaemin Shares Photo Of Himself And Updates Fans On His Condition
- Soompi: Updated: NCT Showcases All 18 Members In Stunning And Artistic New “2018 Yearbook” Video And Photos