This New Mystery K-Drama About Seeing People’s Past Hookups Is Going Viral

K-drama fans, we've got your next must-watch show to add to your list: S Line

Adapted from the popular Naver webtoon of the same name, the drama revolves around the existence of, you guessed it, S Lines. But what are they exactly?

Well, they're glowing red threads that appear above a person's head, connecting them to others they've slept with. The more sexual partners a person has, the more S Lines appear above them. 👀

And when a pair of glasses that allow ordinary people to see S Lines appear on the black market, you can just imagine what kind of chaos ensues…

Watch the trailer below:

Starring in the drama are Lee Soo-hyuk, Lee Da-hee, and Arin, who make up the trio of main characters

Lee Soo-hyuk, whom you probably know as that sexy oppa with the super deep voice and vampire vibes, takes on the role of Han Ji‑wook. As an attractive, free-spirited detective, Ji-wook chases after the truth of the S Lines, investigating strange deaths tied to these red connections.

Meanwhile, Lee Da-hee, who was previously in hit K-dramas like I Can Hear Your Voice and Search: WWW, as well as one of the hosts of popular Korean dating reality show Single's Inferno, is playing Lee Gyu-jin. A high school teacher, Gyu-jin may seem sweet and unassuming, but behind her unsettling calmness hides secrets of her own.

Rounding up the cast is Arin from K-pop girl group Oh My Girl. Having played some minor roles in previous dramas, her role in S Line as Shin Hyun‑heup is highly-anticipated to be her breakout. Hyun-heup is a teenager who was born with the ability to see the S Lines without the need of any tech.

The drama is already making waves online, with many fans excited to tune in and unravel the mysteries

Clips from the show have been going viral, particularly one of a sizzling romantic intro scene featuring Lee Soo-hyuk, which had everyone fangirling hard in the comments, hehe. 😏

S Line recently made its debut at CANNESERIES 2025 (Cannes International Series Festival) is an annual festival dedicated to celebrating the best in international television series, where it was praised for its original concept and bold narrative.

It even made history by becoming the first Korean series to win the Best Music Award for its haunting soundtrack composed by Lee Jun‑oh. So, you can expect a rich, emotionally charged score that will give you all the feels.

The best part about this drama is that it's a short one, making it totally bingeable

It's only a total of six episodes! You'll get two new episodes every week, so you can either wait till they're all out and binge-watch in one go, or follow along every week.

Whichever option you choose, you're definitely gonna be on the edge of your seat with each action-packed episode of this thriller mystery drama that's full of twists and turns.

You can watch S Line on Tonton, where new episodes will drop at 10am every Wednesday and Friday

It'll be airing from 16 July to 1 August, which means the first two episodes are already out. Faster start watching now!