TV-MAwavve7.6(159)

S Line

Name: S Line
Director: Ahn Joo-Young
Genre: Sci-Fi & Fantasy, Drama, Mystery
Released: 2025-07-11
Rating: 7.6

S라인

“Social. Sex. Secrets.”

Sci-Fi & FantasyDramaMystery

Watch Free

We checked 8 streaming services in India on 04 Jun 2026 at 18:35 IST

2025

1 Season

6 Episodes

Ended

TV-MA

About

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.

#shocking#based on webcomic or webtoon

Cast

Lee Soo-hyuk

as Han Ji-wook

ARIN

as Shin Hyeon-heup

Lee Da-hee

as Lee Gyu-jin

Lee Eun-saem

as Kang Seon-ah

Kim Dong-young

as Oh Dong-sik

Lee Gwang-hee

as Joon-seon

Lee Han-joo

as Yoon Ji-na

Woo Ji-hyun

as Jung-woo

Nam Kyu-hee

as Kim Hye-yeong

Oh Woo-ri

as Lee Kyung-jin

Oh Seung-jun

as Lee Ji-won

Kim So-young

as Choi I-seo

Park Seong-il

as Bang Seong-jin

Lee Ga-sub

as Oh Jung-min

Park Ye-ni

as Hee-won

Jeong Jae-kwang

as Bartender

Jang Sun

as Hyeon-heup's Mother

Seasons

Season 1

6 episodes2025

Hyeon-heup has been able to see the mysterious 'S lines' since birth, a secret only she could perceive. But when special glasses allow others to see it too, long-buried secrets and hidden connections surface, pulling her into a web of desire, betrayal, and dangerous truths in this haunting thriller.

Episodes

Season 1

The Girl With The Sunglasses

Jul 11, 202551m6.0

Hyun-heup, a girl who was born with the ability to see the S-line that indicates sexual relations. Because of this ability, Hyun-heup's family faces tragedy, and Hyun-heup becomes a reclusive loner for a long time. Then one day, a series of suspicious murders occur around Hyun-heup, and Hyun-heup uses his ability to see the S-line to track down the case...

The Animal Kingdom

Jul 11, 202551m6.0

Hyun-heup goes to Bangju High School after receiving a mysterious text message. There, he reunites with Seon-ah, a middle school classmate and Ji-wook's niece. However, Seon-ah is a victim of bullying from bullies. One day, when the bullying from bullies reaches its peak, Seon-ah discovers a mysterious pair of glasses in her locker...

A Fall Into Darkness

Jul 18, 202557m6.5

Seon-ah falls from the rooftop and falls into a coma. Ji-wook cries out in self-reproach and anger, and cooperates with Hyun-heup to find the culprit. Meanwhile, Jung-woo, an English teacher at Bangju High School, witnesses his girlfriend's affair before their wedding and breaks off the engagement. And soon after, he finds a pair of glasses on his desk...

Miseong Motel

Jul 18, 202555m6.5

Ji-wook, who was continuing the investigation to find the culprit of the Seon-ah incident, hears about the S-line from Hyun-heup, but doesn't believe it. Meanwhile, Bang Ju-goo, an employee who lives in a goshiwon and dreams of becoming an actor, finds S-line glasses at Mi-seong's house and feels liberated, but soon after, he sees a woman connected to the music teacher he had a crush on and feels strong jealousy...

The Glasses

Jul 25, 202555m6.5

Ji -wook, who finally discovered glasses in the bloody bathtub of aesthetic, admits that the words of Hyun -suk were true. Use the power of glasses to start an investigation into sexual violence in the runway. And I think that the person connected to the only one S line of Sun -ah is the culprit of the Sun -a case.

Chaos on the Horizon

Jul 25, 202551m5.5

Ji -wook finds out the truth about Sun -ah's S -line through glasses. Meanwhile, Hyun -suk, ahead of his 18 -year -old birthday, makes a big decision and meets the Jun -sun, which leads to an unknown confusion.

Where does S Line rank today?

S Line is #1136 on the CineFlixo Daily Streaming Charts today.

Highest: #1136
Top 10: 0 days
Top 100: 0 days

Watch S Line Online Free — All Episodes in HD

If you've been searching for S Line all episodes in HD, CineFlixo has you covered. This well-rated Coreano sci-fi & fantasy, drama, and mystery title from 2025 is available to stream instantly — no ads to fight through, no paid subscriptions, no annoying redirects.

About S Line

“Social. Sex. Secrets.”

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. Across 1 season and 6 episodes, originally airing on wavve.

S Line Cast and Characters

The cast features Lee Soo-hyuk (as Han Ji-wook), ARIN (as Shin Hyeon-heup), Lee Da-hee (as Lee Gyu-jin), Lee Eun-saem (as Kang Seon-ah), and Kim Dong-young (as Oh Dong-sik). Their performances are a major reason S Line has built such a passionate audience.

Where to Watch S Line Online

Want to watch S Line online without paying? CineFlixo is the easiest way. Click play and the series starts in seconds. No popups, no "5 day trial that auto-charges" — just the show.

▶ Watch S Line Now

Why People Are Watching S Line

There's a reason S Line keeps showing up on "must-watch" lists. What makes it work is emotional weight that hits where it counts, tight pacing that earns its twists, and world-building that respects the audience's intelligence. If you enjoy Coreano storytelling that doesn't follow the same tired beats, this is the kind of show you'll end up recommending to friends.

Frequently Asked Questions about S Line

Where can I watch S Line online for free?

You can watch S Line online free on CineFlixo. Just open the page and hit play — no signup, no subscription, full HD streaming on phone, tablet, or desktop.

How many episodes does S Line have?

S Line has 6 episodes across 1 season. All episodes are available to stream right here on CineFlixo.

Is S Line good? What's the rating?

S Line holds a 7.6/10 rating based on 159 reviews — well above average.

Who is in the cast of S Line?

The main cast includes Lee Soo-hyuk, ARIN, Lee Da-hee, and Lee Eun-saem, plus a strong supporting ensemble.

Is S Line available in Coreano?

Yes — S Line was originally produced in Coreano and that's the version you'll stream here on CineFlixo. English subtitles are provided when available.

When was S Line released?

S Line first aired in 2025.

Do I need an account to watch S Line on CineFlixo?

No. CineFlixo is free and you can watch S Line without creating an account. Sign-up is optional — only useful if you want a personal Watchlist or to comment on episodes.

Similar Series You Might Like

If you enjoyed S Line, check out Tiger Coming In, Teenage Mom, Mercy for None, Into the Fire: The Lost Daughter, and Beauty Newbie.

Frequently Asked Questions

Where can I watch S Line for free?

You can watch S Line online for free on CineFlixo. All 6 episodes across 1 season are available to stream in HD without a subscription, signup, or paywall. Just open the show page and press play.

How many seasons and episodes does S Line have?

S Line currently has 1 season and a total of 6 episodes. The series status is "Ended", so the episode count may grow as new seasons are released. You can browse the full episode list on CineFlixo and continue watching from where you left off.

What is S Line about?

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 belongs to the Sci-Fi & Fantasy, Drama, Mystery genres.

In which language is S Line originally available?

S Line was originally produced in KO. On CineFlixo the show is available in its original KO audio. Check the player options on the watch page for available subtitle tracks.

When was S Line first released?

S Line first premiered on July 11, 2025 (2025). The series has since concluded its run.