Second Sister (2025): cast, story & where to watch
2025 · Film · ★ 6
Released in 2025, Second Sister is a thriller and crime film directed by Shin Jai-ho, running about 90 minutes.
What it’s 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.
Who’s in it. Second Sister stars Kim Min-gue, Kang Seo-ha, Seong Hee-hyeon and Park Dong-hyeok.
How it landed. With an audience score of 6.0/10, Second Sister has drawn a solid, mixed-to-positive response.
Where to watch. Streaming options change often. See the full, country-by-country breakdown on our where to watch Second Sister page.
If you liked it. Fans of Second Sister tend to enjoy The Dark Knight, Pulp Fiction, Parasite and Fight Club.
Frequently asked
- Where can I watch Second Sister (2025)?
- Streaming, rental and purchase options for Second Sister change frequently. Check our where-to-watch page for the latest availability in your country.
- Is Second Sister worth watching?
- Second Sister holds an audience score of 6.0 out of 10, and is a strong pick if you enjoy thriller and crime. Reactions are mixed, so it may depend on taste.
- Who stars in Second Sister?
- Second Sister stars Kim Min-gue, Kang Seo-ha, Seong Hee-hyeon and Park Dong-hyeok.
- When was Second Sister released?
- Second Sister was released in 2025, with a runtime of about 90 minutes.