Drama: S Line
Type: Drama
Format: Standard Series
Country: South Korea
Episodes: 6
Aired: Jul 11, 2025 – Jul 25, 2025
Aired On: Friday
Genres: Thriller, Mystery, Drama, Fantasy
Duration: 50 min.
Content Rating: 15+ – Teens 15 or older
Synopsis
The show will tell the story of a mysterious red line that appears above people’s heads, connecting them to those they’ve had sexual relations with. Han Ji Uk is a detective who wants to discover the truth about the mysterious red line. Lee Gyu Jin is a quirky high school teacher, and Sin Hyeon Hop is a high school student who has been able to see the red line since birth.
Cast
Main Roles
- Lee Soo Hyuk as Han Ji Uk
- Lee Da Hee as Lee Gyu Jin
- A Rin as Sin Hyeon Hop
- Lee Eun Saem as Kang Seon A
Support Roles
- Jang Sun as [Hyeon Heup’s mother]
- Lee Ga Sub as O Jeong Min [Teacher]
- Kim Dong Young as O Dong Sik [Detective]
- Nam Kyu Hee as Kim Hye Yeong [Student]
- Lee Kwang Hee as Jun Seon [Student]
- Lee Han Ju as Yun Ji Na [Idol trainee]
- Oh Woo Ri as Gyeong Jin [Student]
- Park Sung Il as Bang Seong Jin [Teacher]
- Woo Ji Hyun as Jeong U
- Oh Seung Jun as Lee Ji Won [Student]
- Kim Ga Young
Guest Roles
- Park Ye Ni as Hui Won (Ep. 1)
- Kang Ji Hoon as [Reporter] (Ep. 1)
- Jung Jae Kwang as [Bartender] (Ep. 2)
- Jo Han Chul as Kim Byeong Cheol (Ep. 3)
- Lee Sang Hee as Gyeong Mi [Jeong U’s sister] (Ep. 3)
- Kim Se A as A Yul [Jeong U’s niece] (Ep. 3)
- Bae So Young as Ri Sa (Ep. 4)
- Jung Mi Hyung as Mi Seong (Ep. 4)
- Shin Dong Mi as Kang So Min (Ep. 4)
- Kim Jeong Woo as [Music teacher] (Ep. 4)
- Kim Jun Hyung as Seo Han Yu (Ep. 5)
- Kim Yae Eun as Jeon Hui (Ep. 6)
- Jung Hyun Seok as [Police station team leader]
- Kim Ro A as Sin Hyeon Heup [Child]
Final Thoughts
“S Line” is a visually gripping mystery with a supernatural twist. The concept of the visible red line adds a unique, compelling element to the genre, promising intense suspense, psychological elements, and exploration of forbidden secrets.
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