S Line

S Line is a Korean Drama, In a world not so different from our own, a mysterious red line—visible only to some—suddenly appears above people’s heads, connecting them to those they’ve had sexual relationships with. Hyun-heup, a quiet high school student, has seen these lines since birth, a secret that isolates her from her peers. When a new pair of glasses is invented, allowing anyone to see these S-Lines, society is thrown into chaos as secrets are exposed and relationships crumble under the weight of truth.
Hyun-heup is drawn into the mystery when a detective, Han Ji Wook, seeks her help to uncover the origins of the S-Lines and stop the turmoil. Together, they navigate a world where privacy is lost and every connection is laid bare, learning hard lessons about trust, shame, and the cost of exposing what should remain hidden.