Since 2004, LEE Jung-Sub worked as a writer, producer, and director, showing his exceptional skill and versatility among the professional South Korean Filmmakers. He co-produced and wrote script Rikidozan: A Hero Extraordinary (2004), Arang (2006), The Perfect Couple (2007), Rainbow Eyes (2007), Romantic Island (2008), as well as scripted Real (2017). His recent feature film, Fallen (2020), claimed the Jury Special Mention Award at the 40th Fantasporto-Oporto International Film Festival and officially selected for 23rd Bucheon International Fantastic Film Festival as only Korean work competing among international film selections.