S Line is currently going viral on social media after the first two episodes aired on July 11, 2025. The K-drama quickly grabbed netizens’ attention thanks to its unique and controversial premise. What many might not know is that S Line is actually adapted from a popular manhwa of the same name that was first published on the Naver Webtoon platform back in 2011.

S Line

The S Line manhwa was written and illustrated by Little Bee, consisting of 50 episodes released between November 2011 and November 2012. More than a decade later, the work was finally adapted into a Korean drama directed and written by Ahn Joo Young.

Synopsis: A Red Line That Reveals Dangerous Secrets

S Line presents a fictional story about a strange phenomenon—the appearance of a red line (known as the "Sex Line") on people’s heads. This line reveals who someone has had intimate relations with, and how often. At first glance, the idea seems humorous, but as the story progresses, the S Line becomes a dangerous tool—capable of ruining lives and even triggering murder.

The early episodes of the manhwa touch on sensitive issues such as premarital chastity, religious corruption, manipulated court trials, and the exploitation within the film industry. In later episodes, the conflicts intensify as the red line becomes a weapon to destroy reputations—or end lives altogether.

Read the Full S Line Webtoon and Spoilers

For fans who can’t wait for episodes 3 and 4—scheduled to air on July 18, 2025—the S Line Webtoon is legally available on Comic Naver and the Naver Webtoon app. All 50 episodes are accessible, along with several key spoilers that give deeper insight into the storyline’s direction.

This drama adaptation is further proof of the rising influence of Korean manhwa in the entertainment industry, especially with the growing demand for thought-provoking stories that reflect real-world issues.

With S Line’s success, more classic manhwa adaptations may follow. Don’t miss out on what’s next—whether in drama or Webtoon form.

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