Jump to: Plot or Description | Episode Guide | Cast | Reviews | Recommendations | Where to Watch | Final Thoughts
Plot or Description
S Line is a 2025 Wavve original fantasy‑thriller directed by Ahn Joo‑young and adapted from the acclaimed webtoon by Kkomabi. Suddenly, glowing red threads—called “S‑Lines”—appear above people’s heads, connecting those who have had sexual relationships. The ability to see these lines is initially exclusive to a teen, Shin Hyun‑heup (Arin), but becomes available to others via mysterious glasses.
Detective Han Ji‑wook (Lee Soo‑hyuk) investigates a recent murder when he starts seeing these S‑Lines. Meanwhile, high school teacher Lee Gyu‑jin (Lee Da‑hee) stands out as the only person with no visible line above her head. As hidden secrets and desires surface, the characters spiral into moral and psychological chaos. The finale shocks with a dystopian twist—S‑lines go public, and society faces a reckoning.
Episode Guide
S Line consists of 6 episodes, released in pairs on July 11, 18, and 25, 2025. Runtime ranges from 50 to 60 minutes:
- Ep 1–2: Introduction to Hyun‑heup's ability, first murders, glasses distribution begins.
- Ep 3–4: Bullying scandal, secret exposure, Gyu‑jin’s unresolved past.
- Ep 5–6: Final confrontation on rooftop, Gyu‑jin revealed as mastermind, S‑line spreads globally.
Cast
- Lee Soo‑hyuk as Han Ji‑wook – charismatic detective investigating the S‑Lines;
- Arin (OH MY GIRL) as Shin Hyun‑heup – student born with the ability to see S‑Lines;
- Lee Da‑hee as Lee Gyu‑jin – enigmatic teacher with no visible S‑Line;
- Lee Eun‑saem as Kang Seon‑ah – Ji‑wook’s niece and Hyun‑heup’s classmate;
- Supporting: Kim Dong‑young, Lee Kwang‑hee, Oh Woo‑ri, Lee Han‑joo, Nam Kyu‑hee, and others.
Reviews
Critics and Industry: Praised for bold premise, psychological depth, and its score—the first Korean series to win **Best Music** at Cannes International Series Festival in 2025.
Fans and Viewers: Mixed reactions. Some praised the show’s atmospheric visuals and mystery, while many criticized the abrupt tonal shift and rushed finale—calling it a “wasted potential” and confusing transition from thriller to dystopian fantasy.
Recommendations
If you enjoyed S Line’s blend of mystery, fantasy, and social commentary, you might also like:
- Love Alarm – another webtoon adaptation where emotional connections become visible;
- SF8 – anthology of sci‑fi stories tackling moral and technological themes;
- Hellbound – a dark fantasy series rich in symbolic commentary;
- Liar Game – psychological games and hidden agendas between characters.
Where to Watch
- Wavve – original and exclusive—requires subscription, approx. $8/month;
- Outside South Korea, some platforms like Viki or Kocowa may carry it, but availability varies; fans often use VPN to stream Wavve legally.
Final Thoughts
S Line dares to pose uncomfortable questions about desire, shame, and societal surveillance. Its stylish execution and haunting premise make it compelling—but many viewers felt the payoff in the final episodes didn’t match its initial promise. Still, Lee Da‑hee’s quietly captivating performance, Arin’s transformation, and Lee Soo‑hyuk’s visual presence are standout elements.
If you’re in the mood for bold, symbolic thrillers with lingering ambiguity—and can forgive a rushed conclusion—**S Line** is an intriguing binge. Just don’t expect tidy answers.
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