Heeseung is the oldest and the center of the group ENHYPEN, ranked 5th with 1,137,323 votes in I-Land. Also called Heedeungnie.

He is from Uiwang, South Korea and has an older brother. He trained for 3 years, 1 month. He went to Hanlim Gwangnam High School.

He likes singing, dancing, basketball, songwriting and song composing. He specially adore Eating ramen and playing games. Fans knows many charm of him but his voice and his eyes stood out the most.