Overview
A young woman with the ability to see mysterious red connections between lovers discovers her secret gift is no longer unique when special glasses granting similar powers appear on the black market.
Seasons & Episodes
Season 1
Hyeon-heup has been able to see the mysterious 'S lines' since birth, a secret only she could perceive. But when special glasses allow others to see it too, long-buried secrets and hidden connections surface, pulling her into a web of desire, betrayal, and dangerous truths in this haunting thriller.
Key Information
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Cast & Crew
Lee Soo-hyuk
Han Ji-wook
ARIN
Shin Hyeon-heup
Lee Da-hee
Lee Gyu-jin
Lee Eun-saem
Kang Seon-ah
Kim Dong-young
Oh Dong-sik
Lee Gwang-hee
Joon-seon
Lee Han-joo
Yoon Ji-na
Woo Ji-hyun
Jung-woo
Nam Kyu-hee
Kim Hye-yeong
Oh Woo-ri
Lee Kyung-jin
Oh Seung-jun
Lee Ji-won
Kim So-young
Choi I-seo
Photos
Frequently Asked Questions
A young woman with the ability to see mysterious red connections between lovers discovers her secret gift is no longer unique when special glasses granting similar powers appear on the...
S Line has 1 season with 6 episodes.
S Line premiered on July 11, 2025.
No, S Line has ended. The final episode aired on July 25, 2025.
S Line originally aired on wavve. Check your local streaming services for availability.
S Line was created by Ahn Joo-Young.
S Line has a rating of 7.5/10 based on user reviews.
S Line is classified as Sci-Fi & Fantasy, Drama, Mystery.