Lee Jong-hyun (; born August 1, 1998) is a South Korean actor. He is best known for his role as Kim Se-hyun in TVING's original series Study Group (2025).
Lee was born on August 1, 1998, in Goseong, Gangwon Province, South Korea.
Lee was a soccer player until middle school. He graduated from high school in the science track.
Lee has already completed his mandatory military service.
Lee was cast by Goldmedalist through social media and later signed with the agency. Shortly afterward, he began his mandatory military service, during which the agency awaited his discharge.
In 2023, Lee made a small appearance in Duty After School.
In 2025, Lee officially debuted in the TVING original series, Study Group as Kim Se-hyun.