S Line - Season 1

First aired: 7/11/2025 6 episodes

Han Ji Wook is a detective looking to know what is the truth behind the mysterious red line. Kyu Jin, a funny high School teacher. Hyun Hob, a high schooler who has been able observe the red line from birth. The show will present the story of a cryptic red line that appears over head of the people in the show, connecting them to people with whom who have had sexual relations with them.

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Episodes

1. Girl With Sunglasses

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...

2. Animal Kingdom

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...

3. Episode 3

Aired: 7/18/2025

4. Episode 4

Aired: 7/18/2025

5. Episode 5

Aired: 7/25/2025

6. Episode 6

Aired: 7/25/2025