Ian

On June 4, 2020, Sungchul was introduced as a participant in the CJ ENM and Big Hit Entertainment's then upcoming survival show I-LAND. On the first episode, he performed "Shoot Out" by MONSTA X, along with Jaebeom and Jimin and was able to enter "I-LAND". However, during the second episode, he was "eliminated" as he received 9 votes and placed in "Ground".

On the seventh episode, he was unfortunately eliminated from the show and was unable to participate in Part 2. On April 3, 2023, Sungchul was introduced as LUN8's first member under the stage name Ian. They debuted on June 15, 2023 with their first mini album Continue?.