Dr. Brain (Korean: Dr. 브레인; RR: Dr. Beurein) is a South Korean streaming television series created by writer, director, and executive producer Kim Jee-woon. The sci-fi thriller is based on the Korean webtoon of the same name by Hongjacga. Lee Sun-kyun stars in the lead role as a brain scientist trying to solve the mysterious death of his family by hacking into the brains of the deceased. The series is the first Korean-language show produced for Apple TV+; it debuted on November 4, 2021 to accompany the streaming service's launch in South Korea.