Second Sister
망내인: 얼굴 없는 살인자들
“Find the murderer hiding in the network”
We checked 8 streaming services in India on 07 Jun 2026 at 07:59 IST
About
High school student 'Ji-eun' was the victim of the crime, but distorted online posts and malicious comments made her into the perpetrator in the public eye, driving her to take her own life. Her sister 'So-eun' finds detective 'Jun-kyung' to uncover the truth behind her sister's unfair death, and he begins hunting down a suspect in cyberspace. As clues are revealed one by one, the case grows from a simple rumor into a complex web of truth involving anonymous accounts.
Cast
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Watch Second Sister Online Free in HD
If you've been searching for Second Sister full movie in HD, CineFlixo has you covered. This popular Coreano thriller and crime title from 2025 is available to stream instantly — no ads to fight through, no paid subscriptions, no annoying redirects.
About Second Sister
“Find the murderer hiding in the network”
High school student 'Ji-eun' was the victim of the crime, but distorted online posts and malicious comments made her into the perpetrator in the public eye, driving her to take her own life. Her sister 'So-eun' finds detective 'Jun-kyung' to uncover the truth behind her sister's unfair death, and he begins hunting down a suspect in cyberspace. As clues are revealed one by one, the case grows from a simple rumor into a complex web of truth involving anonymous accounts. Running 90 minutes.
Second Sister Cast and Characters
The cast features Kim Min-gue, Kang Seo-ha, Seong Hee-hyeon, and Park Dong-hyeok. Their performances are a major reason Second Sister has built such a passionate audience.
Where to Watch Second Sister Online
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▶ Watch Second Sister NowWhy People Are Watching Second Sister
Second Sister flies under the radar but it deserves your attention. What makes it work is tight pacing that earns its twists. If you enjoy Coreano storytelling that doesn't follow the same tired beats, this is the kind of film you'll end up recommending to friends.
Frequently Asked Questions about Second Sister
Where can I watch Second Sister online for free?
You can watch Second Sister online free on CineFlixo. Just open the page and hit play — no signup, no subscription, full HD streaming on phone, tablet, or desktop.
How long is Second Sister?
Second Sister runs for 90 minutes (about 1.5 hours).
Is Second Sister good? What's the rating?
Second Sister holds a 6.0/10 rating based on 2 reviews — a solid pick if the genre interests you.
Who is in the cast of Second Sister?
The main cast includes Kim Min-gue, Kang Seo-ha, Seong Hee-hyeon, and Park Dong-hyeok.
Is Second Sister available in Coreano?
Yes — Second Sister was originally produced in Coreano and that's the version you'll stream here on CineFlixo. English subtitles are provided when available.
When was Second Sister released?
Second Sister was released in 2025.
Do I need an account to watch Second Sister on CineFlixo?
No. CineFlixo is free and you can watch Second Sister without creating an account. Sign-up is optional — only useful if you want a personal Watchlist or to comment on episodes.
Similar Movies You Might Like
If you enjoyed Second Sister, check out Rosemary's Baby, Sleepers, Scarface, Cool Hand Luke, and Bullitt.
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Frequently Asked Questions
Common questions about Second Sister
Where can I watch Second Sister for free?
You can watch Second Sister (2025) online for free on CineFlixo. Just click "Watch Free" on this page to start streaming instantly — no account, subscription, or downloads required.
What is Second Sister about?
Second Sister is a Thriller/Crime film. High school student 'Ji-eun' was the victim of the crime, but distorted online posts and malicious comments made her into the perpetrator in the public eye, driving her to take her own life. Her sister 'So-eun' finds detective 'Jun-kyung' to uncover the truth behind her sister's unfair death, and he begins hunting down a suspect in cyberspace. As clues are revealed one by one, the case grows from a simple rumor into a complex web of truth involving anonymous accounts.
When was Second Sister released?
Second Sister was released on December 17, 2025. It has a runtime of 1h 30m. The film was produced by Studio Joyful.
Who stars in Second Sister?
Second Sister stars Kim Min-gue, Kang Seo-ha, Seong Hee-hyeon and Park Dong-hyeok. The full cast list is available in the Cast section above.
Is Second Sister available in HD?
Yes, Second Sister is available to stream in high definition (HD) on CineFlixo. Our players automatically deliver the best quality your connection supports — no extra setup needed.