On June 1, 2020, Heeseung was introduced as a contestant in the CJ ENM and Big Hit Entertainment's reality survival show I-LAND. On September 18, 2020, he ranked 5th place by global votes and became a member of the boy group ENHYPEN.
- I-LAND (Mnet, 2020) - contestant
- In I-LAND's first episode, he performed "Boss" by NCT U.
- His MBTI personality type is INFJ.
- Prior to I-LAND, he trained for 3 years.
- He got the highest individual mark given by the producers in the show with a score of 93 for his Fake Love performance.
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