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The new mystery K-drama, S Line, follows a unique story around a strange phenomenon where glowing red lines called "S Lines" suddenly appear above people’s heads. They are connecting them to everyone they’ve ever been sexually involved with.
At the heart of the story is Shin Hyun-heup, a high school girl who’s been able to see these lines since birth. This ability has made her feel like an outsider, especially after witnessing painful moments in her own family. Alongside her is Han Ji-wook, a detective investigating a string of mysterious deaths connected to the lines.
This plot twist makes this K-drama stand out among other typical crime-investigation stories. The first two episodes are out already, and S Line Episodes 3 & 4 are scheduled to come out on Friday, July 18, 2025. The drama can be streamed on Wavve, the official streaming platform.
Another key figure in the drama is Lee Gyoo-jin, a quiet teacher who surprisingly has no visible lines, raising questions about his past and his real identity. What could be the reason he has no line above him?
Keep reading to find out more about the upcoming episodes.
S Line Episodes 3 & 4: Everything to know
Fans waiting for the next episodes of S Line can catch both Episode 3 and Episode 4 on Friday, July 18, 2025. In South Korea, they’ll go live around 11:00 p.m. KST, which means viewers in other time zones like the UK can expect the release at approximately 8:00 a.m. GMT on the same day.
Each episode is expected to be about 50 minutes long, so viewers should plan for nearly an hour of content per episode. If you're wondering where to stream S Line, the show is currently exclusively available on Wavve, a popular South Korean streaming platform.
As of now, there’s no update on whether the drama will be available on internationally known Korean drama platforms like Viki or Viu. So international fans might need to wait or look for alternative options.
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What happened in the S Line Episodes 1-2: A quick recap
The first two episodes of S Line introduce the main characters, Han Ji-uk, Lee Gyoo-jin, Shin Hyun-heup, and Seon-a. The episode kicks off with a murder that is tied to the red lines.
While the detective and teacher cannot see those lines, Seon-a has recently found a pair of glasses that allow her to see the lines. She is shocked to learn how many lines her uncle has and even notices the lines above other students' heads at the school.
Shockingly, she learns that one teacher has an affair with a student and how many times they have been intimate. Seon-a thought she was the only one who could see those lines, but Hyeon-hop shows up in the bathroom and reveals that she can also see them.
By the end of Episode 2, Seon-a meets the teacher whom she blackmailed over his affair. She demanded 20 million, but he couldn't arrange the money and asked Seon-a if she could delete the evidence of his affair and wait for him to arrange the demanded money.
However, the next moment, her teacher receives a message from his wife, who saw the picture and learned about the affair. Furious to learn the truth, the teacher pushes Seon-a from the rooftop, leading to her death.
Just as she collapsed, soaked in blood, Hyun-heup arrived at the scene. She had warned Seon-a that those Lensa were dangerous, and now, they had claimed her life.
What to expect from S Line Episodes 3 & 4?
In the upcoming episode of S Line, Han Ji-uk will be hit with the news of Seon-a’s death, which is initially treated as a suicide, at least until a suspect comes into the picture. Meanwhile, Gyoo-jin has his doubts. He doesn’t believe Seon-a ended her own life.
Her special glasses are now in the hands of one of the school’s teachers, who seems ready to use them for his own benefit. But as shown in the very first episode, the power to see those lines has rarely brought anything good to those who possess it.
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