2025 • TMDB 7.5 • 1 season, 6 episodes • Sci-Fi & Fantasy, Drama, Mystery
Overview
Shin Hyeon-heup has lived her whole life with a secret nobody else can see: thin red lines floating above people, revealing the romantic connections between them. She has learned to look away, to stay quiet and to survive in a world that does not know her gift exists. That fragile balance collapses when glasses that grant the same sight appear on the black market, turning private lives into public targets and drawing dangerous attention to everyone the lines touch. A detective, a teacher and other strangers are pulled into a web of desire, jealousy and murder as Hyeon-heup tries to protect the truth about herself. S Line is a bold, unsettling fantasy mystery that asks what happens when intimacy can no longer be hidden. Across six taut episodes it turns a striking visual idea into a tense, adult thriller about secrets, power and the cost of being seen.
Creator and Main Cast
S Line was created by Ahn Joo-Young and Kkomabi for wavve. The cast includes Lee Soo-hyuk as Han Ji-wook (6 episodes), ARIN as Shin Hyeon-heup (6 episodes), Lee Da-hee as Lee Gyu-jin (6 episodes), Lee Eun-saem as Kang Seon-ah (6 episodes), Kim Dong-young as Oh Dong-sik (6 episodes), and Lee Gwang-hee as Joon-seon (6 episodes).
Seasons Snapshot
S Line has 1 season with 6 episodes. The miniseries premiered on July 11, 2025, and ended with the finale, “Chaos on the Horizon,” on July 25, 2025.
Why Watch S Line?
Watch it for one of the most original premises in recent K-drama, a mystery that is genuinely unpredictable and a compact six-episode run with no filler. Its red-line imagery is haunting, its characters are morally messy in the best way, and its ending leaves plenty to argue about afterward. If you like dark fantasy with a thriller’s pace, this is a sharp, bingeable pick.
Trailer
Watch the official trailer on YouTube: S-Line | Main Trailer | Wave Original
Where to Watch
In the US, S Line is not currently available for streaming. Availability was checked against JustWatch US listings on October 30, 2026, and may change over time.
Leave a Reply