Second Sister
망내인: 얼굴 없는 살인자들
“Find the murderer hiding in the network”
Synopsis
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.
Trailers, Teasers & Extra Featurettes
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Second Sister | tvN MoviesOfficial
Type: Trailer • Published 2026-07-21
Top Cast
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Key Information & Fast Facts
- Director
- Shin Jai-ho
- Screenplay & Story
- Chan Ho-kei, Shin Jai-ho
- Original Score
- Yoo Sang-hoon
- Original Title
- 망내인: 얼굴 없는 살인자들
- Country of Origin
- South Korea
- Spoken Languages
- Korean
- Runtime
- 1h 30m
- Production Studios
- Studio Joyful, Big Ocean ENM, 스튜디오 아발리, New Branch Contentory
Creative Leadership & Key Crew
Shin Jai-ho
Chan Ho-kei, Shin Jai-ho
Yoo Sang-hoon
Kim Hak-su
Kim Hee-won
Lee Hyun-joo, Kim Hoon Gwang, Ji Sang-chul
Department Leadership Roster
Shin Jai-ho
Director
Shin Jai-ho
Writer
Ji Sang-chul
Producer
Kim Hak-su
Director of Photography
Kim Hee-won
Editor
Kim Sae-ro-mee
Production Design
Lim Ju-hyun
Costume Design
Yoo Sang-hoon
Original Music Composer
Production Stills & Gallery
Official cinematic photography and background stills for Second Sister.
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Frequently Asked Questions About Second Sister
Quick factual answers about cast, synopsis, director, box office, and release information.
What is Second Sister 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 directed Second Sister?
Second Sister was directed by Shin Jai-ho.
Who stars in Second Sister?
The principal cast of Second Sister includes Kim Min-gue, Kang Seo-ha, Seong Hee-hyeon, Park Dong-hyeok.
When was Second Sister released and how long is it?
Second Sister was released in 2025 with a total runtime of 1h 30m.
Who composed the musical score for Second Sister?
The original motion picture soundtrack for Second Sister was composed by Yoo Sang-hoon.
Is Second Sister based on a book or true story?
Second Sister is adapted from the following source material: Novel: "Chan Ho-kei".