S Line

S Line

S라인

Social. Sex. Secrets.

Ended First aired 11/Jul/2025 South Korea Korean 1 season(s) 6 episode(s)
Sci-Fi & FantasyDramaMystery
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.
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Air Time

Source: Asia/Seoul · Your timezone: America/New_York

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The episode airs in your local time New York - United States at:

10:00 PM on Thursday
Notice: This scheduled time is based on: /11:00 AM/Asia/Seoul/Friday.

Show Insights

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TimeScore 33% Skip It
Binge Meter 48% Slow Burn
Episode Pulse Quiet 40% activity score
Drop Rate 0% Very Low

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Seasons & Episodes

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Season 1 · Season 1
6 episode(s) · Air date: 11/Jul/2025
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Season Overview

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.

Season Overview

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.

S1E6
Chaos on the Horizon
Air date: 25/Jul/2025 · Time: 11:00 · Runtime: 51 min
Summary

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.

Summary

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.

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S1E5
The Glasses
Air date: 25/Jul/2025 · Time: 11:00 · Runtime: 55 min
Summary

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.

Summary

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.

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S1E4
Miseong Motel
Air date: 18/Jul/2025 · Time: 11:00 · Runtime: 55 min
Summary

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...

Summary

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...

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S1E3
A Fall Into Darkness
Air date: 18/Jul/2025 · Time: 11:00 · Runtime: 57 min
Summary

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...

Summary

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...

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S1E2
The Animal Kingdom
Air date: 11/Jul/2025 · Time: 11:00 · Runtime: 51 min
Summary

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...

Summary

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...

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S1E1
The Girl With The Sunglasses
Air date: 11/Jul/2025 · Time: 11:00 · Runtime: 51 min
Summary

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...

Summary

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...

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Cast

Main cast members.

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Lee Soo-hyuk
Lee Soo-hyuk
Han Ji-wook
ARIN
ARIN
Shin Hyeon-heup
Lee Da-hee
Lee Da-hee
Lee Gyu-jin
Lee Eun-saem
Lee Eun-saem
Kang Seon-ah
Kim Dong-young
Kim Dong-young
Oh Dong-sik
Lee Gwang-hee
Lee Gwang-hee
Joon-seon
Lee Han-joo
Lee Han-joo
Yoon Ji-na
Woo Ji-hyun
Woo Ji-hyun
Jung-woo
Nam Kyu-hee
Nam Kyu-hee
Kim Hye-yeong
Oh Woo-ri
Oh Woo-ri
Lee Kyung-jin
Oh Seung-jun
Oh Seung-jun
Lee Ji-won
Kim So-young
Kim So-young
Choi I-seo
Park Seong-il
Park Seong-il
Bang Seong-jin
Lee Ga-sub
Lee Ga-sub
Oh Jung-min
Park Ye-ni
Park Ye-ni
Hee-won
Jeong Jae-kwang
Jeong Jae-kwang
Bartender
No Photo
Jang Sun
Hyeon-heup's Mother
Oh Ah-yeon
Oh Ah-yeon
Kwak Chae-rin (Eps 3)

Crew

Creators, directors, writers, and production crew.

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Ahn Joo-Young
Ahn Joo-Young
Director
No Photo
Kkomabi
Comic Book

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