Lee Da Hee takes on a fascinating role in the new fantasy thriller “S Line,” where she plays a high school teacher with a shocking secret. The drama, based on a popular webtoon, explores a world where red lines appear above people’s heads, revealing their intimate relationships.
The series is set to premiere on July 11, 2025, and has already generated buzz with its unique concept and star-studded cast, including Lee Soo Hyuk and OH MY GIRL’s Arin.
What Is “S Line” About?
In “S Line,” mysterious red lines suddenly appear above people’s heads, connecting them to those they have had physical relationships with. These lines, called “S Lines,” expose private secrets and create chaos in society.
Lee Da Hee plays Kyu Jin, a high school teacher who stands out because she has no S Line at all. Despite her warm and caring appearance, she hides a deep mystery. Her student, Hyun Heup (Arin), has the ability to see these lines since birth and becomes suspicious of her teacher’s unusual condition.
Meanwhile, Lee Soo Hyuk stars as Han Ji Wook, a detective investigating the truth behind the S Line phenomenon. The story unfolds as secrets are exposed, relationships are tested, and society faces the consequences of these visible connections.
Lee Da Hee’s Intriguing Role
Lee Da Hee’s character, Kyu Jin, is described as a teacher with a gentle smile but a hidden agenda. She watches her students closely, noticing even the smallest changes in behavior.
“For some, it will become a weakness that is impossible to hide, while others will try to exploit it,” Kyu Jin says in the teaser, hinting at the drama’s dark themes.
Her lack of an S Line makes her a key figure in the story, raising questions about her past and true intentions.
Arin’s Unique Ability and Detective Lee Soo Hyuk’s Investigation
Arin plays Hyun Heup, a high school student who has always been able to see the S Lines. She becomes curious about her teacher’s missing line and gets drawn into the mystery.
Lee Soo Hyuk’s character, Han Ji Wook, is a detective trying to uncover the truth behind the S Lines. The teaser shows him standing in front of a wall covered in red threads, suggesting a deeper conspiracy.
“Things changed after wearing the glasses,” Ji Wook says, hinting at a device that allows people to see the lines.
Behind the Scenes and Production Details
The drama is directed by Ahn Ju Young, who also co-wrote the script based on the webtoon by Ggomabi. It will have 6 episodes and air on Wavve.
The series was also selected for the 2025 Canneseries Festival, where its first two episodes premiered. The director described it as a story about how society could collapse when private boundaries are broken.
Fan Reactions and Expectations
Fans are excited about the drama’s fresh concept and strong cast. Many are curious about Lee Da Hee’s mysterious role and how the S Line phenomenon will unfold.
The teaser has already sparked discussions online, with viewers praising the eerie atmosphere and suspenseful tone.
Where to Watch
“S Line” premieres on July 11, 2025, on Wavve. Fans can also check out the latest teasers and updates on official platforms.
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