No Mercy (2019 South Korean Film)
No Mercy (Korean: 언니; RR: Eonni) is a 2019 South Korean action film directed by Im Kyung-Taek. The film follows the story of two sisters, In-Ae and Eun-Hye, whose lives are upended by a sudden disappearance. The film was released in South Korea on January 1, 2019.

Plot
Following the death of their parents, In-Ae (played by Lee Si-Young) and her younger sister Eun-Hye (played by Park Se-Wan) live together, relying solely on one another. Their bond is tested when Eun-Hye goes missing. In-Ae embarks on a desperate search to find her sister, ultimately seeking revenge against those responsible for her disappearance.
Production
The film was directed by Im Kyung-Taek, who also co-wrote the screenplay with Kim Min. Production took place in 2016, with filming beginning on June 13 and concluding on October 4 of that year. During its development phase, the film carried the working title Onyuwol, which translates literally to "Midsummer."

Cast
The film features a central cast portraying the primary characters involved in the search for Eun-Hye:
- Lee Si-Young as Park In-Ae
- Park Se-Wan as Park Eun-Hye
- Lee Jun-Hyuk as Han Jung-Woo
- Choi Jin-Ho as Park Young-Choon
- Lee Hyeong-Cheol as Ha Sang-Man
- Kim Won-Hae as CEO Jung




