S Line

Complete Synopsis Of Korean Drama S Line (2025)

S Line adalah drama Korea terbaru bergenre thriller-fantasi yang tayang perdana pada 11 Juli 2025 di platform streaming Wavve. The Drama is adapted from the popular webtoon of the same name by Kkomabi (also known as Little Bee), which was released in 2011-2012 on Naver Webtoon. Directed by Ahn Joo Young, which marked his debut in directing a drama Series, S Line it consists of 6 episodes with a duration of about 50 minutes per episode, of which two episodes are released every Friday. The Drama has stolen global attention since its premiere at the Cannes International Series Festival 2025, where S Line award winning Best Music thanks to his stunning musical compositions.

Storyline

S Line it tells of a mysterious phenomenon that shakes society: the appearance of an invisible red line above everyone's head, called the “S Line”. This line connects a person with other individuals with whom he has had sexual relations, revealing personal secrets that have been hidden so far. This phenomenon provokes social chaos, emotional conflicts, jealousy and even violence, as intimate secrets are exposed suddenly. The number of red lines above a person's head indicates their “body count” or the number of sexual partners, which can only be seen with special glasses or by certain individuals with innate abilities.

The story centers on three main characters:

1. Shin Hyun Heup (played by Arin from OH MY GIRL) : a high school student who from birth has the rare ability to see S Line without AIDS. This ability led him to live in isolation and social pressure, especially after a traumatic experience in childhood when he accidentally exposed his parents ' infidelity through a red line drawing he made, which culminated in the murder of his father by his mother. Hyun Heup becomes the key in unraveling the mystery S Line when he starts working together with Detective Han Ji Wook.
2. Han Ji Wook (played by Lee Soo Hyuk) : a charismatic detective with a dark past who is initially skeptical of phenomena S Line. However, having invented special glasses that allow him to see red stripes, he is obsessed with unraveling the origins of this phenomenon, especially since the stripes seem to be associated with a series of unusual serial murder cases.
3. Gyu Jin (played by Lee Da Hee): a mysterious and absent high school teacher S Line at all, an anomaly that arouses suspicion. Gyu Jin gets involved in Ji Wook and Hyun Heup's investigation, but the secrets he keeps add a layer of intrigue to the story.

When the phenomenon S Line spread and more and more people who can see the red line through special glasses, the world becomes chaotic. Personal secrets are revealed, personal relationships are destroyed, and social conflicts escalate. Hyun Heup, Ji Wook, and Gyu Jin try to solve the mystery behind S Line, including his connection to a serial murder case, while facing their own personal wounds and moral dilemmas. The Drama explores heavy themes such as privacy, sexuality, social norms, and the impact of information disclosure in the digital age.

Showtimes and platforms

• Premiere Date: July 11, 2025
• Release Schedule: Two episodes every Friday (episodes 1-2: July 11, 2025, episodes 3-4: July 18, 2025, episodes 5-6: July 25, 2025)
• Platform Streaming: Wavve (exclusive), with Indonesian subtitles available on several platforms such as Bilibili.
• Notes: As of July 2025, there is no confirmation whether S Line it will be available on other streaming platforms such as Netflix, Viu, or iQiyi for Southeast Asian audiences, including Indonesia.

Cast and characters

• Lee Soo Hyuk as Han Ji Wook: Free-spirited detective known through his role in Queen Woo (2024) and Tomorrow (2022).
• Lee Da Hee sebagai Gyu Jin: Eccentric high school teacher who previously performed in Island (2023) and Mr. Plankton (2024).
• Arin sebagai Shin Hyun Heup: OH My GIRL member who showed her acting skills in Alchemy of Souls (2022).
• Lee Eun Saem: Portrays supporting characters that add depth to the story, known from other popular dramas.

Drama Review S Line

Advantages

1. Unique and provocative story concept: S Line it offers a fresh and bold premise with themes of sexuality and Privacy, which are rarely explored in Korean dramas. The concept of red lines as markers of intimate relationships creates a narrative full of intrigue and relevance to privacy issues in the digital age.
2. Stunning Acting: Lee Soo Hyuk brings Han Ji Wook's character to life with charisma and emotional depth, while Arin puts on a surprising performance as Hyun Heup, showing a fragile but determined side. Lee Da Hee sebagai Gyu Jin berhasil mencuri perhatian dengan aura misteriusnya.
3. Cinematography and music: The Drama was praised for its stylish visuals and gripping atmosphere backed by award-winning musical compositions at Cannes Series 2025. The music manages to amplify the tension and emotion in each scene.
4. Mature webtoon adaptation: Although there were changes from the original webtoon (for example, the red line could only be seen by some people with special glasses, not everyone), this adaptation stayed true to the core of the story and added new elements that made it suitable for the drama format.
5. Exploration Of Social Themes: S Line not only does it present mysteries and thrillers, but it also delves into issues such as social norms, the stigma of sexuality, and the impact of information disclosure, making viewers rethink privacy and human relationships.

Disadvantages

1. Sensitive Themes: The themes of sexuality and the exposure of personal secrets may seem too heavy or controversial to some viewers, especially since the play does not avoid intense depictions of violence and emotional conflict.
2. Limited Duration: With only 6 episodes, some viewers may feel the storyline is too fast - paced or some subplots lack depth.
3. Limited Accessibility: Due to its exclusive airing on Wavve, viewers outside of South Korea, including Indonesia, may have difficulty accessing it without a VPN or additional streaming platforms providing Indonesian subtitles.
4. The Complexity Of The Story: For audiences unfamiliar with the psychological thriller genre, a storyline full of twists and heavy themes may feel confusing or overwhelming.

Interesting Facts

• S Line is the first serial project of director Ahn Joo Young, who previously directed the film A Boy and Sungreen (2018).
• Webtoon S Line (also known as Eseulain or S Rain) consists of 50 episodes and is available on Naver Webtoon, although there is no official English or Indonesian translation yet.
• Drama ini merupakan kolaborasi pertama Lee Soo Hyuk, Lee Da Hee, dan Arin dengan platform Wavve.
• S Line award winning Best Music at the 2025 Cannes International Series Festival, making it the first Korean drama to win an award in this category.

Compatibility with Children

S Line not suitable for children for the following reasons:

1. Sensitive and mature content: This Drama deals with the themes of sexuality, intimate relationships, and the exposure of personal secrets that are not appropriate for underage audiences. Depictions of red lines indicating “body count” as well as conflicts such as jealousy, betrayal, and violence can confuse or annoy children.
2. Scenes Of Violence: S Line contains thriller elements with serial murder cases and explicitly depicted violence, which is not safe for children.
3. Heavy psychological themes: This story explores trauma, social isolation, and moral dilemmas, which are too complex for children to understand and can trigger anxiety or discomfort.
4. Age Rating: Although no official age rating has yet been mentioned in the source, based on the theme and content, S Line likely intended for an adult audience (18 years and older) or at least late teens (15-17 years) with parental supervision.

Age Recommendation: This Drama is more suitable for adult audiences or late teens who are already able to understand sensitive and complex themes. Parents are advised to review the content first before allowing teens to watch, given the themes of sexuality and violence raised. Alternatively, for children or young teenagers, Korean dramas with light genres such as Extraordinary You or True Beauty maybe more appropriate.ConclusionS Line is a bold, provocative, and suspenseful Korean drama, with a unique premise that shakes up social norms and delves into issues of privacy and sexuality. Backed by strong acting, stunning cinematography and award-winning music, the drama offers an intense and unforgettable viewing experience for fans of the thriller-fantasy genre. However, due to its sensitive theme and content, S Line not recommended for children and more suitable for adult or late teen audiences with supervision. For Korean drama fans looking for an out-of-the-box story, S Line is a must-watch option, although its accessibility may be limited due to the exclusivity of the Wavve platform.

If you want to read the original webtoon, S Line available on Naver Webtoon in Korean (50 episodes), and can be translated using apps such as Naver Papago for readers who are not fluent in Korean. To watch, please monitor Wavve's official Instagram account (

.official) for schedule updates and additional streaming platforms.