S Line: Release date news, cast details, streaming details, and more about the fantasy thriller K-Drama

With a number of popular webtoons getting adapted on screen for K-dramas, the latest on the line is S Line, a fantasy thriller based on the webtoon by Kkomabi. Set to premiere on July 11, 2025, the official synopsis of the show, as per Asian Wiki, mentions,

“Suddenly red lines appear above people’s heads. These red lines connect people who have had sex relations. Due to this, embarrassing or secret sides of people are revealed. People call these red lines "S Line."

The synopsis further mentions,

Han Ji-Wook (Lee Soo-Hyuk) is a detective with an attractive appearance and free spirit. He chases after the truth of the S Line. Kyu-Jin (Lee Da-Hee) is a high school teacher with unique charm. Shin Hyun-Heup (Arin) is a high school student. She has been able to see the red lines since she was born.”

As is clear from the synopsis, the premise is quite unique and might be interesting. Let us now explore all the available details about the show, including its release and streaming information.

Also read: Tomorrow, with You: 10 similar K-dramas for when you need more romance and time travel

S Line release date and streaming details

The show will be premiering with its first two episodes on July 11, 2025, on Wavve. It will follow a weekly release schedule, with two new episodes dropping every Friday. Consisting of 6 episodes, the final two episodes of the K-drama will air on July 25, 2025.

Since this is a Wavve original, viewers will need an active subscription to the platform to watch the new episodes as they drop. The streamer offers a subscription plan of $15.99 per month, according to SaaSworthy. Wavve does not offer a free trial period of subscription.

S Line cast details

Choi Ye Won stars as Hyun Heup. Her character is shown to be able to see these red lines since her childhood. Choi Ye Won is mostly popular by her stage name Arin and has previously been associated with OH MY GIRL.

Lee Soo Hyuk stars as Detective Han Ji Hyuk, with whom Hyun Heup teams up to find the origination of the special glasses that let people see the mysterious red lines, which necessarily sends lives into chaos as concerns of privacy arise. Lee Da Hee stars as Gyu Jin, a teacher who has the same ability as Hyun Heup to see the red lines.

Given the premise dealing with a tabooed subject like sexual relationships and how technology can threaten privacy if taken too far, the show received high praise at the 8th Cannes International Series Festival, where it was also launched.

S Line will be streaming on Wavve.

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