Everyone has a secret. But what if your deepest secret was suddenly exposed by a red line hanging over your head, connecting you to every sexual partner you’ve ever had? In this new reality, privacy is dead. The upcoming mystery-fantasy thriller, “S Line,” will explore how people are connected, exposed, and judged by these red lines. Read on to discover all the details about this new webtoon based Korean drama, “S Line,” including its release date, cast lineup, characters, and more.
“S Line” Korean Drama (2025)
The upcoming mystery-fantasy thriller “S Line” is a live-action from Kkomabi’s popular and provocative webtoon of the same name. The director and screenwriter of the drama is Ahn Joo Young, known for her works in “A Boy in Sungreen,” “Pig Riding Hood,” “Cartwheel,” and more.
The series depicts a supernatural phenomenon where a visible red line (the “S Line”) appears above people’s heads. These lines connect them to everyone they have had a sexual relationship with.
Synopsis
The story follows a young woman, Hyun Heup, who was born with the unique ability to see the indelible red lines that hang over people’s heads. These lines tie them to their sexual partners.
However, global chaos emerges when someone suddenly develops special glasses that replicate her special ability, allowing anyone who wears them to see what these ‘S-lines.’ With people’s private histories suddenly exposed, society is thrown into turmoil. She teams up with a detective to find the person responsible for creating the glasses and selling them to the black market, ultimately to stop the escalating issues.
The series explores the dramatic consequences of losing all privacy as people are suddenly connected, exposed, and judged for their past relationships.
“S Line” Cast and Characters
Arin (OH MY GIRL) as Hyun Heup
Hyun Heup is a high school student who has been able to see the “S Lines” in her entire life. Born with this special ability, she becomes the central figure in the mystery.
Lee Soo Hyuk as Han Ji Wook
Han Ji Wook is a free-spirited detective with a stunning visual presence and a mysterious aura. He is the detective who is in charge of investigating the “S Lines” case.
Lee Da Hee as Han Gyu Jin
Han Gyu Jin is a high school teacher with a bold and unconventional personality. She becomes captivated by the “S Line” phenomenon, which caught his attention, and is drawn into the mystery surrounding it.
Fun Facts & Reasons to Watch
Based on a Famous Webtoon
The series is based on a webtoon by Kkomabi, the acclaimed creator who created Netflix’s hit “A Killer Paradox.”
Premiere at Cannes
Before hitting the small screen, “S Line” has already garnered significant international attention. The series was chosen for the main Competition section at CANNESERIES (the Cannes International Series Festival) 2025, where it gave global audiences their first look.
Provocative and Controversial Theme
The drama “S Line” is based on a smart webtoon. The original story was known for its social critique. It explores themes of privacy, judgment, and relationships. The plot will expose people’s sexual histories. It is expected to be a major topic of discussion.
A Perfect Blend of Genres
“S Line” mixes sci-fi fantasy, mystery, social commentary, and human drama. It’s offering something for every type of viewer.
Arin’s Comeback on Screen
Oh My Girl’s Arin is back on the small screen with a new role. This time, you can witness Arin’s acting development as she plays a more mature and complex role.
Visually Striking Cast
The visuals of the cast in this series are undeniable. Lee Da Hee’s strong charisma, Lee Soo Hyuk’s stunning visuals, and Arin’s captivating charm. Their visuals strengthen the reasons to watch their on-screen chemistry.
Relevant Social Commentary
Private lives are often made public in this social media era. The themes that the drama explores, such as privacy, shame, and social judgment, are relevant to society today.
“S Line” Release Date
The release date of Korean drama “S Line” is set for July 11, 2025., on Wavve.
Watch these trailers for “S Line” before its premiere!
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