Parasite star Lee Sun-kyun, 48, was found dead in a parked car in Seoul.
Lee was under investigation for alleged illegal drug use, denying the accusations.
Lee, known for his role in Parasite, won global acclaim as the film earned four Oscars in 2020.
The actor debuted on stage in 2001 and entered television and film in the following years.
The actor, who expressed love for acting, left a lasting impact on the global film industry.