S Line (2025)
A Korean sci-fi mystery about love made visible — and the chaos that follows when that power falls into the wrong hands.
S Line - Series Information
- Original Title: S라인
- First Air Year: 2025
- Last Air Year: 2025
- Created by: Ahn Joo-Young, Kkomabi
- Type: TV Series
- Genres: Sci-Fi, Fantasy, Drama, Mystery
- Content Rating (US): TV-MA
- Number of Seasons: 1
- Number of Episodes: 6
- Status: Ended
- Original Language: Korean
- Spoken Languages: Korean
- First Air Date: July 11, 2025 (United States - TV-MA), July 11, 2025 (Canada - 18+), July 11, 2025 (Brazil - 18), July 11, 2025 (South Korea - 19)
- Networks: wavve
- Alternative Titles: S Rain (US), الخط إس (SA), Sライン (JP), S线 (CN), Линии С (RU), S LINE (TW)
- Production Companies: Sidus
- Production Countries: South Korea
S Line - Plot
A young woman with the ability to see mysterious red connections between lovers discovers her secret gift is no longer unique when special glasses granting similar powers appear on the black market.
S Line - Trailer
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S Line - Cast & Crew
Creator(s)
- Ahn Joo-Young
- Kkomabi
Main Cast
- Lee Soo-hyuk
- ARIN
- Lee Da-hee
- Lee Eun-saem
- Lee Gwang-hee
- Lee Han-joo
- Nam Kyu-hee
- Oh Woo-ri
- Kim Dong-young
- Oh Seung-jun
S Line - FAQs
Is S Line based on a webtoon or comic?
S Line is adapted from a webtoon, which is reflected in its visually inventive premise about glowing red threads connecting lovers. The original source material was created by Kkomabi, who is also credited as one of the series' creators alongside Ahn Joo-Young.
Who are the main actors in S Line?
The series stars Lee Soo-hyuk as Han Ji-wook and ARIN as Shin Hyeon-heup in the lead roles. They are joined by Lee Da-hee, Lee Eun-saem, Lee Gwang-hee, Lee Han-joo, Nam Kyu-hee, Oh Woo-ri, Kim Dong-young, and Oh Seung-jun.
What is S Line about?
S Line follows a young woman born with the rare ability to see glowing red lines connecting people who are romantically linked. Her world is upended when mysterious glasses capable of replicating her power begin circulating on the black market, stripping away what made her singular.
What do the red lines mean in S Line?
The red lines are a supernatural visual metaphor for romantic bonds between people. Only the protagonist can naturally perceive them — until the black-market glasses democratize this power. The lines drive the central tension, raising questions about fate, love, and what happens when intimacy becomes visible to anyone.
When did S Line first air?
S Line premiered on July 11, 2025, releasing simultaneously in several regions including the United States, Canada, Brazil, and South Korea. The series aired on the Korean streaming platform wavve and wrapped up its six-episode run in 2025.
How many episodes does S Line have?
S Line consists of six episodes across its single season. The series has concluded, with all episodes having aired in 2025. It's a compact, self-contained story that wraps up its supernatural mystery within that tight episode count.
What is the content rating for S Line?
S Line carries a TV-MA rating in the United States, indicating it is intended for mature audiences. In South Korea it is rated 19+, and in Canada and Brazil it is rated 18+. Viewer discretion is advised for younger audiences.
What shows are similar to S Line?
If S Line caught your attention, you might enjoy Sweet Home, Connect, A Killer Paradox, or Light Shop for their blend of Korean genre storytelling and supernatural intrigue. For webtoon-adjacent drama with romantic threads, Hyde, Jekyll, Me and Meow, the Secret Boy offer comparable vibes.
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