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Hyun-heup, a girl who was able to see the S-line that indicates sexual relations since birth. Because of this ability, Hyun-heup's family faces tragedy, and Hyun-heup becomes a reclusive loner for a long time.
Hyun-heup goes to Bangju High School after receiving a mysterious text message. There, he reunites with Seon-ah, a middle school classmate and Ji-wook's niece.
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Ji-wook investigates Seon-ah's case and doubts Hyun-heup's S-line theory. Goshiwon resident Bang Ju-goo finds liberating S-line glasses at Mi-seong's, then feels jealous seeing a woman linked to his crush.
Ji-wook finds glasses in a bloody bathtub, confirming Hyun-suk's claims. Using the glasses, he investigates runway sexual assault cases and suspects someone linked to Sun-ah's S-line is behind her case.
Ji-wook discovers Sun-ah's S-line secret through glasses. Hyun-suk makes a major choice before turning 18 and encounters Jun-sun, causing confusion.