Ji -wook finds out the truth about Sun -ah's S -line through glasses. Meanwhile, Hyun -suk, ahead of his 18 -year -old birthday, makes a big decision and meets the Jun -sun, which leads to an unknown confusion.

Ji -wook, who finally discovered glasses in the bloody bathtub of aesthetic, admits that the words of Hyun -suk were true. Use the power of glasses to start an investigation into sexual violence in the runway. And I think that the person connected to the only one S line of Sun -ah is the culprit of the Sun -a case.

Ji -wook, who continued to investigate to find the culprit of Sun -ah, hears about the S -line from the Hyunsuk, but increases. Meanwhile, living in Koshiwon and dreaming of an actor and dreaming of an actor, the staff, and Mi -sung finds S -line glasses in the aesthetic growth and feels it for liberation, but soon after seeing a woman connected to the music teacher who had been unrequited.

Sun -ah falls out of the rooftop and falls into a coma. Because of this, Ji -wook is enthusiastic with self -reproach and anger, and cooperates with Hyun to find the culprit. Meanwhile, Jung -woo, an English teacher, witnesses the affair of his girlfriend ahead of marriage. And after a while, I find glasses on my desk ...

Hyeon -suk to go to school after receiving a question in question. There, he reunites with Sun -ah, a middle school alumni and a nephew of Ji -wook. However, Sun -ah is a bullying who is harassed by Iljin. One day, when the harassment of the Iljin reached its extreme, Sun -ah found a mysterious glasses in his locker ...

Hyeon -suk, a girl who was able to see the S -line that shows sexual relationships since birth. Because of that ability, the family of the Hyunsims will be tragedy, and the scenes will be a hermit for a long time. Then one day, a mysterious serial murder occurred around the Hyunsim, and Hyunsux traces the case with the ability to see the S -line.