Season 1
(2025)
Overview
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.
Cast
as Han Ji-wook
as Shin Hyeon-heup
as Gyu-jin
as Kang Seon-ah
as Joon-seon
as Yoon Ji-na
as Kim Hye-yeong
as Gyeong-jin
as Oh Dong-sik
as Lee Ji-won
Episodes
Girl With Sunglasses 6.0
July 11, 2025
Hyun-heup, a girl who was born with the ability to see the S-line that indicates sexual relations. Because of this abil…
Animal Kingdom 6.0
July 11, 2025
Hyun-heup goes to Bangju High School after receiving a mysterious text message. There, he reunites with Seon-ah, a midd…
Apartment 6.5
July 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…
Meishin Hotel 6.5
July 18, 2025
Ji-wook, who was continuing the investigation to find the culprit of the Seon-ah incident, hears about the S-line from …
The Glasses 6.5
July 25, 2025
Ji -wook, who finally discovered glasses in the bloody bathtub of aesthetic, admits that the words of Hyun -suk were tr…
S Line 5.5
July 25, 2025
Ji -wook finds out the truth about Sun -ah's S -line through glasses. Meanwhile, Hyun -suk, ahead of his 18 -year -old …