Hey, everyone! How’s it going? Today I’m here to review the fantasy thriller S Line, which premiered on July 11, 2025, and is already creating a frenzy with its bold and twisted premise!
Premiered on Wavve on July 11, 2025, S Line follows a weekly release schedule with two new episodes dropping every Friday. The series consists of 6 episodes in total for the 2025 season, making it a compact but intense viewing experience perfect for binge-watching.
Based on the webtoon of the same name by Komabi, known for ‘A Killer Paradox,’ the show brings to life a strikingly imaginative concept. The thriller show stars Lee Soo-hyuk, Lee Da-hee and Arin in key roles, delivering what many are calling one of the most provocative K-dramas of 2025.
S Line is a fantasy thriller in which red lines suddenly appear above people’s heads, connecting them to people with whom they have had physical relationships and thus revealing sensitive personal information overnight. This unique premise creates a world where privacy becomes impossible and intimate secrets are exposed for all to see.
A young woman
A young woman with the ability to see mysterious red connections between lovers discovers her secret gift is no longer unique when special glasses granting similar powers appear on the black market. This red line is called the “S LINE” and can only be seen but not physically touched.
The story begins when these supernatural lines become visible to more people, turning what was once private into a public spectacle. The show tells the story of a mysterious red line that appears above people’s heads, connecting them to those they’ve had sexual relations with, creating chaos and moral dilemmas throughout society.
The new K-drama, S Line, certainly has an R-rated premise and intro, but under the surface, the show almost seems to be more like a sociological experiment. The series explores themes of privacy, shame, and how society deals with exposed intimacy in an increasingly connected world.
Han Ji-Wook (Lee Soo-hyuk): The Detective on the Hunt
Han Ji-Wook (Lee Soo-Hyuk) is a detective with an attractive appearance and free spirit. He chases after the truth of the S Line. Lee Soo-hyuk brings his characteristic intensity to this role, playing a character who becomes obsessed with understanding the supernatural phenomenon.
As a detective, Han Ji-Wook approaches the S Line mystery with both professional curiosity and personal stakes. His investigation leads him down dark paths where he must confront not only the supernatural elements but also the human nature revealed by this strange phenomenon.
Lee Soo-hyuk’s performance balances the character’s determination with vulnerability, showing a man who realizes that some truths are more dangerous than others. His chemistry with the supporting cast creates tension that drives the narrative forward.
Shin Hyun-Heup (Arin): The Cursed Gift
Shin Hyun-Heup (Arin) is a high school student. She has been able to see the red lines since she was born. Hyun Heup (OH MY GIRL’s Arin), a high school student born with the unique ability to see the “S LINE,” narrating somberly, “I am cursed”.
Arin delivers a compelling performance as a teenager burdened with a supernatural ability she never asked for. Her character serves as the emotional anchor of the series, showing the psychological toll of witnessing everyone’s intimate connections from a young age.
The evolution of Hyun-Heup throughout the series demonstrates Arin’s growth as an actress, moving beyond her idol background to deliver a nuanced portrayal of a young woman struggling with her unique burden and its consequences.
Kyu-Jin (Lee Da-hee): The Teacher’s Dilemma
Kyu-Jin (Lee Da-Hee) is a high school teacher with unique charm. She added, “Gyu Jin’s true self gradually emerges as the episodes progress. Please watch to see how that connects with the S-lines”.
Lee Da-hee brings depth to the role of a teacher caught in the supernatural chaos affecting her students and community. Her character represents the adult perspective on how this phenomenon disrupts not just individual lives but entire social structures.
The actress’s portrayal shows a woman trying to maintain professionalism while dealing with the moral complexities that arise when private becomes public. Her interactions with both the detective and her students create layered storytelling that enriches the overall narrative.
Success on Wavve
K-drama S Line released on Wavve platform on July 11 and fans are in awe of the bold scenes. Amid a wave of provocative and daring dramas emerging on OTT platforms, ‘S-Line,’ a Wavve original, is making a bold debut with an intense premise. The series has been generating significant buzz on social media, with Netizens saying it’s ‘very twisted’ and praising its unique approach to fantasy thriller storytelling. Available exclusively on Wavve, S Line represents the platform’s commitment to pushing boundaries in K-drama content.
If you love dark fantasy thrillers with supernatural elements, bold storytelling, and psychological depth, S Line is the perfect series to binge on Wavve.
A provocative and twisted fantasy thriller that explores the consequences of exposed intimacy through supernatural elements, featuring stellar performances from Lee Soo-hyuk, Lee Da-hee, and Arin in a story that challenges societal norms and privacy.
Series Details:
Number of Episodes: 6 episodes (2025 season)
Platform: Wavve
Rating: 7.2/10 (IMDb)
Genre: Dark Fantasy, Supernatural Thriller, Mystery
Protagonists: Lee Soo-hyuk (Han Ji-Wook), Lee Da-hee (Kyu-Jin), Arin (Shin Hyun-Heup)
Antagonist: The supernatural phenomenon itself and societal consequences