2016: Produce 101, K-pop Star 6
Lee Soomin originally appeared on the survival show Produce 101 as a trainee representing Fantagio Music. However, in April 2016, she left the agency after terminating her contract. She was eliminated in episode 10 after ranking in 31st place. 
Later that year, she became a contestant on the competition show K-pop Star 6: The Last Chance. During her time on the show, she was part of the Minari unit. The unit made it to the semi-finals, being eliminated in episode 20.
2017–2018: MIXNINE, FAVE GIRLS
In October 2017, Lee Soomin became a contestant on the survival show MIXNINE. She made it until the final episode, but was eliminated when the boys' team won against the girls' team, and hence ultimately did not get to debut.
2019–present: MYSTIC Rookies
- K-pop Star 6: The Last Chance (SBS, 2016-2017) - contestant
Music video appearances
- ↑ Soompi: “Produce 101” Contestant Lee Soomin Leaves Fantagio Music
- ↑ Produce 101: Episodes 1-10
- ↑ Soompi: Former “Produce 101” Contestants Lee Soo Min And Park So Yeon To Debut In LOEN Girls
- ↑ MIXNINE: Episodes 1-14
- ↑ Soompi: Park So Yeon, Lee Soo Min, And Kim Bo Won Terminate Contracts With FAVE Entertainment
- ↑ @mystic.rookies Official Instagram Update (19 February 2020)