The BEST episodes of S Line

#1 - Glasses

Season 1 - Episode 5 - Aired 7/25/2025

#2 - The Girl with the Sunglasses

Season 1 - Episode 1 - Aired 7/11/2025

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...

#3 - Apartment

Season 1 - Episode 3 - Aired 7/18/2025

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...

#4 - Animal Kingdom

Season 1 - Episode 2 - Aired 7/11/2025

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...

#5 - Meishin Hotel

Season 1 - Episode 4 - Aired 7/18/2025

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...

#6 - A Red Line Connecting People Who Have Had Sexual Relations

Season 1 - Episode 6 - Aired 7/25/2025