Apple TV has built an impressive list of sci-fi hits like Severance, Silo, Pluribus, and Foundation that constantly dominate the conversation. The best of them don’t just deliver high-concept genre thrills, but they also explore humanity in ways that feel genuinely deep and emotional.
That is exactly what makes the Korean sci-fi thriller Dr. Brain such a standout. It is Apple TV’s first Korean-language original, and it checks every box you want from smart sci-fi. The series is stylish and visually sleek, but it is also deeply grounded in themes of grief, memory, and identity. For fans of films like Inception, Dr. Brain feels like a psychological detective story with a mind-bending twist, except instead of breaking into dreams, its hero is hacking into the minds of the dead.
What Is the Apple TV Sci-Fi Series ‘Dr. Brain’ About?
Originally released as a six-episode series in 2021, Dr. Brain was created by filmmaker Kim Jee-woon and based on the Korean webtoon of the same name. It follows Koh Sewon (Lee Sun-kyun), a brilliant brain scientist whose life is shattered after a mysterious accident devastates his family. His young son Doyoon (Jeong Si-o) goes missing and is presumed dead, while his wife Jaeyi (Lee You-young) is left in a coma. Desperate for answers, Sewon turns to experimental neuroscience and begins performing “brain syncs,” a process that allows him to access the memories of the deceased.
As Sewon uncovers more truths, he becomes increasingly disoriented and unable to separate other people’s memories from his own reality. That psychological unraveling becomes the series’ greatest hook, blending mind-bending sci-fi concepts with the emotional turmoil of a man who is falling apart in real time. Lee plays Sewon with raw intensity that makes his grief feel painfully real, grounding the high-concept premise in genuine emotion. Along the way, he crosses paths with private investigator Kangmu Lee (Park Hee-soon) and lieutenant Jiun Choi (Seo Ji-hye), as revelations about Jaeyi pull him into a widening mystery that soon places him in the middle of a murder investigation.
‘Dr. Brain’ Trailer Reveals Sci-Fi Thriller From ‘I Saw the Devil’ Director Coming to Apple TV+
The show is the first Korean language show on Apple.
The series arrived right as global audiences were increasingly embracing international storytelling in a mainstream way, especially following the breakout success of Netflix’s Squid Game and the wider surge in demand for high-quality foreign-language series. Dr. Brain taps into that momentum while also delivering something distinctly its own. It is the kind of bold, high-concept thriller designed for viewers who want their sci-fi to hit on a deeper, more human level, while still delivering genre-blending intrigue and a twisty, genuinely shocking ending.
Why ‘Dr. Brain’ Is Still Apple TV’s Most Underrated Sci-Fi Thriller
What makes Dr. Brain such a standout is how seamlessly it weaves together different genres. At various points, it plays like a family drama disguised as a sci-fi thriller, then shifts into genuinely intense action without ever losing the emotional core of what Sewon is going through. Strip away the brain syncs and the high-concept twists, and the story still works as something deeply human. At its heart, Dr. Brain is about a man unraveling under the weight of grief, searching for answers that may only destroy him further.
Kim Jee-woon’s fantastic direction keeps the series from ever feeling muddled, even as it pushes deeper into surreal territory, and he brings a filmmaker’s eye to the sync sequences in particular. Every memory dive is staged and paced more like intrusive hallucinations than straightforward exposition. Combined with strong writing and committed performances across the board, the show’s cliffhanger ending made it feel like it was building toward a second season.
Unfortunately, real-life tragedy struck before Dr. Brain could ever return for a second season. Lee Sun-kyun, internationally known at the time for the Oscar-winning film, Parasite and widely praised for his work in Dr. Brain, passed away in December 2023 at age 48 of an apparent suicide after being under investigation for illegal drug use. It is always devastating to lose an actor of that talent, especially as more global audiences were beginning to recognize just how exceptional he was. It is impossible not to view the series through the lens of his legacy. That context makes Dr. Brain hit even harder, because Lee’s performance is not only the show’s anchor, it is one of its greatest strengths.
Even with only one season, Dr. Brain is worth watching for its confident direction, sharp writing, and excellent performances, along with a distinctive visual language that makes the series feel sleek and intimate at the same time — even as it dives into increasingly mind-bending territory. Apple TV has no shortage of sci-fi heavyweights, but Dr. Brain remains one of the platform’s most fascinating originals. With its Inception-like mind games, haunting tone and Lee Sun-kyun’s unforgettable performance at the center, it is a one-season thriller that should not be overlooked.
