Sister (시스터) has sparked conversations across the film industry and among audiences worldwide. In this review, we gather perspectives from leading critics and publications to give you a comprehensive view of how the film has been received.

The plot of Sister follows Hae-ran (Jung Ji-so), a woman desperate to fund her younger sibling’s medical treatment, who collaborates with a cold-blooded loan shark, Tae-su (Lee Soo-hyuk), to kidnap So-jin (Cha Joo-young), the daughter of a wealthy family. The film turns into a claustrophobic psychological thriller as the trio remains trapped in a secluded hideout, where shifting loyalties and buried family secrets reveal that none of them are who they initially seemed. The movie ends on a massive cliffhanger when it is revealed that the kidnapping may have been orchestrated by the “victim” So-jin herself to escape her family, leaving the audience in the dark as a final gunshot rings out off-screen while Hae-ran discovers a hidden document that fundamentally changes her understanding of her own sister’s illness.

Directed by Jin Seong-moon, the film features Jung Ji-so, Lee Soo-hyuk, and Cha Joo-young, each delivering performances that shape the narrative.

Sister (2026) 시스터 Movie Trailer | EONTALK

Critics’ Reviews

• Times of India (ETimes): The review highlights the psychological depth of the performances, noting “a gripping claustrophobic thriller that thrives on silence and suspense.”
• Rotten Tomatoes: A desperate woman (Jung Ji-so) kidnaps a wealthy heiress (Cha Joo-young) to pay for her sister’s medical bills, leading to a high-tension psychological battle in a secluded hideout where secrets and motives shift.
• Chosun Ilbo (English Edition)​: “A suffocating, confined-space thriller that relies on psychological warfare rather than physical action.”
• MK News (Maeil Business Newspaper): Focuses on the “minimalist dialogue” and “intense immersion” created by the three leads.
• The Korea Herald : Covers the film’s status as a top thriller in the early 2026 box office and details the performances of Jung Ji-so and Lee Soo-hyuk.
• HanCinema: Provides a collection of local Korean reviews, audience ratings, and full cast/crew credits.

Sister (2026) has earned a net gross of $386,471 (approximately ₩520 million) in the South Korean market as of late March 2026, reflecting its status as a steady niche performer in the thriller genre. Social media buzz and trending hashtags like #Sister2026 and #SisterReview have amplified its popularity among fans of “confined-space” cinema, making it one of the most discussed independent thriller releases of the season.

Overall, Sister blends gripping, claustrophobic, and intense storytelling with strong performances from its lead trio. While some critics praised its lean, minimalist construction and psychological depth, others pointed out its deliberately slow pacing and bleak tone, making it a film that invites diverse opinions.

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