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S Line (TV series)

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S Line
Genre
Based onS Line
by kkomabi
Written byAhn Joo-young
Directed byAhn Joo-young
Starring
Theme music composerLee Jun-oh
Opening themePark Ye-ni – "Between The Lines"
Country of originSouth Korea
Original languageKorean
No. of episodes6
Production
Executive producerHandae Rhee
Production companySidus Pictures
Original release
NetworkWavve
ReleaseJuly 11 (2025-07-11) –
July 25, 2025 (2025-07-25)

S Line (Korean: S라인; stylized as Social. Sex. Secrets.: The S–Lines[1][2][3]) is a South Korean dark fantasy crime thriller television series[4] released on Wavve from July 11, to July 25, 2025. The series is based on the original Naver webtoon of the same name by kkomabi[5] and was written and directed by Ahn Joo-young. It stars Lee Soo-hyuk, Lee Da-hee, Arin, Lee Eun-saem, and Kim Dong-young.[6][7] The drama was invited to compete at the 8th edition of Canneseries.[8]

Synopsis

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Set in the near future, where people's past sexual relationships are visually linked by a glowing red “S Line” visible above their heads. A detective, a mysterious teacher, and a girl born with the ability to see these lines navigate a series of disturbing events triggered by the phenomenon.

Cast

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Main

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  • Lee Soo-hyuk as Han Ji-wook – A free-spirited and handsome detective assigned to a bizarre death case tied to the “S Line”. After wearing special glasses, he’s shocked to see dozens of red lines crisscrossing over his head and resolves to uncover the mystery.[9]
  • Arin as Shin Hyun-heup – The only person naturally born with the ability to see the “S Lines”.[10]
  • Lee Da-hee as Lee Gyu-jin – A mysterious high school teacher whose calm demeanor hides eerie smiles and secrets.[11]
  • Jang Sun as Hyun-heup’s mother – Learns of her husband's affair with her sister after seeing her daughter's S-Line drawings.
  • Kim Dong-young as Oh Dong-sik – Ji-wook’s junior and assistant detective.[12]
  • Lee Eun-saem as Kang Seon-ah – Ji-wook’s niece and Hyun-heup’s classmate.[13]
  • Lee Kwang-hee as Joon-seon – Hyun-heup’s classmate and class president who secretly likes her.[14]
  • Oh Woo-ri as Lee Kyung-jin – A fellow student at Hyun-heup’s school.
  • Lee Han-joo as Yoon Ji-na – A K-pop trainee attending the same high school.[15]
  • Nam Kyu-hee as Kim Hye-young – A classmate who bullies Seon-ah.[16]
  • Kim So-young as Choi I-seo – Another bully.
  • Park Sung-il as Bang Seong-jin – Korean teacher who has an affair with student Hye-young.
  • Woo Ji-hyun as Jung-woo – High school teacher who discovers his fiancée is cheating with a friend.
  • Lee Ka-seop as Oh Jung-min – A serial killer with a history of relationship violence, formerly a math teacher.
  • Park Ye-ni as Hee-won – Jung-min’s ex and Hyun-heup’s new neighbor.
  • Jung Jae-kwang as Bartender – Questioned by Ji-wook while investigating Jung-min.

Episodes

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No.
overall		No. in
season		TitleDirected byWritten byOriginal release date
11"The S-Lines"Ahn Joo-youngAhn Joo-youngJuly 11, 2025 (2025-07-11)7.2
Hyun-hee, a high school girl, can see a mysterious red “S Line” connecting people who have had sexual encounters. After receiving special glasses, she begins seeing these lines more vividly, which changes how she views her classmates and herself.[17]
22"Animal Kingdom"Ahn Joo-youngAhn Joo-youngJuly 11, 2025 (2025-07-11)7.4
As Hyun-hee adjusts to her ability, she notices troubling patterns and social dynamics at her school. Meanwhile, a mysterious incident hints at darker forces tied to the S Lines.[17]
33"Girl with Sunglasses"Ahn Joo-youngAhn Joo-youngJuly 18, 2025 (2025-07-18)7.6
Hyun-hee investigates the history of the red lines and learns of a tragic past involving another girl who saw them. Sunglasses become a symbol of power—and danger.[18]
44"In between two lines"Ahn Joo-youngAhn Joo-youngJuly 18, 2025 (2025-07-18)7.7
As romantic and sexual tensions rise in school, Hyun-hee sees a tangled web of red lines—and faces a decision about whether to act on her feelings or avoid them.[18]
55"The Bloody Destiny"Ahn Joo-youngAhn Joo-youngJuly 25, 2025 (2025-07-25)–
In the penultimate episode, Hyun-hee confronts Ji-wook about their mysterious connection. Meanwhile, the glasses fall into the wrong hands, causing chaos.[19]
66"The Last Word"Ahn Joo-youngAhn Joo-youngJuly 25, 2025 (2025-07-25)–
The story culminates in a dark revelation about the origin of the S Line and Hyun-hee’s destiny. She must choose between accepting the truth or destroying the line forever.[19]

Awards

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Year Award Ceremony Category Nominee Result Ref
2025 Canneseries Best Music Lee Jun-oh Won

References

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  1. ^ Whittock, Jesse (2025-04-28). "'S Line' Director Jooyoung Ahn On The Canneseries Drama, Pushing Society's Boundaries & The Future Of Korean TV". Deadline. Retrieved 2025-07-19.
  2. ^ Kim, Regina. "'The Frog' Review: Netflix Korean Series Thrills--In Its Second Half". Forbes. Retrieved 2025-07-19.
  3. ^ Yoon-seo, Lee (2025-07-08). "Hit webtoon 'S Line' turned into drama series, exploring world with visible sexual connections". The Korea Herald. Retrieved 2025-07-19.
  4. ^ Yoon-seo, Lee (2025-07-08). "Hit webtoon 'S Line' turned into drama series, exploring world with visible sexual connections". The Korea Herald. Retrieved 2025-07-19.
  5. ^ "성관계 한 사람들 머리 위에 붉은 선이...기묘한 'S라인' 떴다" [Red line above the heads of those who had sex... The strange 'S-lines' appeared] (in Korean). JoongAng Ilbo. 2025-07-11. Retrieved 2025-07-16.
  6. ^ Moon Ji-yeon (2025-06-12). "Official: Lee Soo-hyuk, Lee Da-hee, and Arin lead Wavve's provocative fantasy thriller "S Line" premiering July 11". Sports Chosun. Retrieved 2025-07-09.
  7. ^ Sani (2025-07-07). "Lee Soo-hyuk, Lee Da-hee, Arin, and Lee Eun-chun attend press conference for "S Line"". Korea Star Daily. Retrieved 2025-07-09.
  8. ^ Lee Seung-mi (2025-04-02). "'성관계' 소재 파격 드라마 'S라인', 칸 페스티벌 경쟁 진출...이수혁·이다희 주연" [S Line, tackling sexual relationships and red strings of fate, selected for Canneseries competition] (in Korean). Sports Donga. Retrieved 2025-07-12.
  9. ^ Lee Ho-young (2023-08-11). "Exclusive: Lee Soo-hyuk cast as lead in "S Line"". iMBC. Retrieved 2025-07-12.
  10. ^ Yoo Eun-bi (2023-09-01). "Exclusive: Arin cast as female lead in "S Line"". SPOTV News. Retrieved 2025-07-12.
  11. ^ Kang Hyo-jin (2023-09-04). "Lee Da-hee joins cast of "S Line" alongside Lee Soo-hyuk and Arin". SPOTV News. Retrieved 2025-07-09.
  12. ^ Park Jung-sun (2025-07-09). "Kim Dong-young to appear in Wavve drama "S Line"". JTBC. Retrieved 2025-07-09.
  13. ^ Ryu Hyo-rim (2025-07-07). "Press conference for Wavve's "S Line"". Yonhap News. Retrieved 2025-07-09.
  14. ^ Ahn Byung-gil (2023-09-05). "Lee Kwang-hee joins "S Line" as Arin's classmate". Sports Kyunghyang. Retrieved 2025-07-09.
  15. ^ Lee Da-won (2025-09-12). "Rookie actress Lee Han-joo confirmed for "S Line"". Sports Kyunghyang. Retrieved 2025-07-09.
  16. ^ Jang Ah-reum (2025-04-21). "Nam Kyu-hee to attend Canneseries for "S Line"". News1. Retrieved 2025-07-09.
  17. ^ a b "S Line – Episodes 1 & 2 Recap". DM Talkies. 2025-07-12. Retrieved 2025-07-19.
  18. ^ a b "Korean drama S Line episode 3 and 4 release date, what to expect". HerZindagi. 2025-07-17. Retrieved 2025-07-19.
  19. ^ a b "S Line: When will episodes 5 & 6 release? What to expect in the finale". Sportskeeda. 2025-07-17. Retrieved 2025-07-19.
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