Name: S LINE
Released: 2025-07-11T00:00:00.000Z
Cast: Lee Soo-hyuk, Lee Da-hee, Arin

S LINE

TV Show · Thriller · Mystery

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.

2025 · 46m

Starring Lee Soo-hyuk, Lee Da-hee, Arin

Director Ahn Ju-young

EPISODE 1

S Line

Hyeon-heup, born with the ability to see the 'S lines' that reveal people's sexual connections, faces deep personal tragedy due to her power. Isolated by its consequences, she withdraws from the world and lives in solitude for years, until strange events make her return to society.

46 min
EPISODE 2

S Line

Hyeon-heup enrolls in Bangju High School after getting a strange text. There, she unexpectedly reunites with Seon-ah, a former classmate from middle school and the niece of Ji-wook.

46 min
EPISODE 3

S Line

After a rooftop incident leaves Seon-ah in a coma, Ji-wook teams up with Hyeon-heup to uncover the truth, driven by guilt. Meanwhile, teacher Jung-woo ends his engagement after catching his fiancée cheating, only to discover a mysterious pair of glasses on his desk.

52 min
EPISODE 4

S Line

Ji-wook investigates Seon-ah’s case but doubts Hyeon-heup’s theory about the S line. School secretary Mi-seong stumbles upon the infamous glasses - only to be consumed by jealousy when she notices another woman tied to the man she secretly admires.

50 min
EPISODE 5

S Line

Ji-wook discovers a pair of glasses in a bloodstained bathtub, validating Hyun-heup’s story. With the glasses, he begins probing sexual assault cases and suspects that someone connected to Seon-ah's S line may be responsible for what happened to her.

50 min
EPISODE 6

S Line

The mystery of the S lines comes to a dramatic conclusion as loyalties crumble and unexpected truths surface. Hyeon-heup must confront choices that will change lives forever, along with the consequences of seeing and being seen in ways never imagined.

46 min