S Line: When And Where To Watch K-Drama About Mysterious Red Connections, Starring Lee Soo-hyuk And Arin

When And Where To Watch Korean Drama S Line: What if your past relationships followed you around, visible for everyone to see? That’s the unique premise of the latest Korean thriller ‘S‑Line’, starring Lee Soo-hyuk, Lee Da-hee, and Arin. With a gripping mix of fantasy and mystery, the series takes you into a world where glowing red lines expose your deepest secrets, and one shocking murder sets everything into motion. Here’s all you need to know about the plot, total episodes, cast, where to watch, and more.

Korean Drama S Line Plot

Korean drama ‘S Line’s main focus is on red lines that suddenly appear above individuals who have had physical relationships together. The supernatural effect exposes secrets and shifts social dynamics dramatically.

The story of S Line revolves around, “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.”

It will be interesting to see how the web of secrets, intrigue, and suspense unfolds as they try to uncover the truth behind the supernatural effect and its link to crime.

Korean Drama S Line Cast

 

 

 

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• Lee Soo‑hyuk: A charismatic detective who first discovers the S Lines after using special glasses and begins a dark investigation.
• Arin of Oh My Girl: A high‑school girl born with the ability to see these red lines, something she hides, living in isolation.
• Lee Da‑hee: A teacher who strangely has no S Line at all, adding an unsettling mystery.

The chemistry and transformation of these actors, especially Arin, add emotional depth and will keep you hooked.

Korean Drama S Line Release Date

Korean drama ‘S Line’ was released on July 11, 2025, and is set to have six episodes.

Korean drama ‘S Line’  Episode 1 and 2 release date: July 11, 2025

Korean drama ‘S Line’  Episode 3 and 4 release date: July 18, 2025

Korean drama ‘S Line’  Episode 5 and 6 release date: July 25, 2025

Where To Watch Korean Drama S Line On OTT?

 

 

 

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‘S‑Line’ is released on Wavve, a South Korean streaming platform, with two episodes releasing every Friday.

Korean Drama S Line Episode Schedule

• Episodes 1 and 2: July 11, 2025
• Episodes 3 and 4: July 18, 2025
• Episodes 5 and 6: July 25, 2025

 

 

 

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There are six episodes in total, each advancing tension, mystery, and the many questions.

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Korean Drama S Line: Critical Acclaim And Awards

‘S‑Line’ already made history by being the only Korean series at the Cannes International Series Festival in 2025, where it won Best Music, making it the first Korean entry to receive that award. Critics praised its interesting plot, cast, cinematography, and immersive score. The drama is co-written and directed by Joo Young-ahn.

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Why Watch the Korean Drama S Line?

i) Intriguing premise: Supernaturally visible ‘Red Lines’ expose hidden sexual relationships.

 

 

 

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ii) Thriller appeal: A chilling murder mystery tied to supernatural exposure.

iii) Performances: Strong and grounded acting from the leads, especially Arin’s transformation.

iv) Music: Korean drama ‘S Line’ won the Best Music Award at the 8th Cannes International Series Festival in 2025. This Cannes‑winning score enhances mood and atmosphere while watching the drama. 

If you love watching thriller series with a fantasy twist, the S‑Line is worth a watch.

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Image credit: Instagram/ Wavve