About S Line
S Line imagines a near-future Korea thrown into turmoil when a strange red line begins to appear in the sky above ordinary people. The line is not random. It traces the hidden personal connections between individuals, drawing a visible thread from one person to another and exposing relationships that were meant to stay private. Overnight, the unspoken architecture of who-knows-whom becomes something anyone can simply look up and see.
What starts as a curiosity quickly hardens into a social crisis. Special glasses that let wearers perceive the lines turn rumor into proof, and a society built on discretion begins to fracture under the weight of total exposure. Reputations collapse, trust erodes, and the public appetite for judgment grows sharper than the search for truth. The series treats the phenomenon as a metaphor for surveillance culture and the cost of a world with no privacy left to protect.
At the center are a high-school student who can see the lines more clearly than anyone and an investigator pulled into the case as the fallout spreads. Together and at odds, they chase the origin of the phenomenon while institutions, opportunists, and frightened citizens scramble to control or weaponize it. Tense and morally uneasy, S Line asks what is left of a person once every connection they ever made is laid bare for the crowd to interpret.