The Truth Beneath (, lit.
 "There Is No Secret") is a 2016 South Korean thriller film directed by Lee Kyoung-mi, her second directorial outing after 2008's "Crush and Blush".
 The film stars Son Ye-jin and Kim Joo-hyuk.
The Last Witness () is a 2001 South Korean thriller film directed by Bae Chang-ho and starring Lee Jung-jae, Ahn Sung-ki and Lee Mi-yeon.
 It is based on the novel of the same name by Kim Seong-jong, and is the second adaptation of the book, the first being in 1980.
Misbehavior (, lit.
 "Female Teacher") is a 2016 South Korean thriller film written and directed by Kim Tae-yong.
 The film stars Kim Ha-neul, Yoo In-young and Lee Won-keun.
The Day a Pig Fell Into the Well (돼지가 우물에 빠진 날, "Dwaejiga umul-e ppajin nal") is a 1996 Korean drama film and the directorial debut of Hong Sang-soo.
 It stars Bang Eun-hee, Jo Eun-sook, Park Jin-song, Lee Eung-kyung and Kim Eui-sung.
 It was also the feature film debut of Song Kang-ho.
 The title derives from a 1954 book by John Cheever.
Northern Limit Line () is a 2015 South Korean naval thriller film written and directed by Kim Hak-soon, based on the real-life events of the Second Battle of Yeonpyeong.
 It stars Kim Mu-yeol, Jin Goo, and Lee Hyun-woo.
I Saw the Devil () is a 2010 South Korean psychological action thriller film directed by Kim Jee-woon, written by Park Hoon-jung, and starring Lee Byung-hun and Choi Min-sik.
 The film introduces the character of NIS agent Kim Soo-hyun (Lee Byung-hun), who embarks on a quest of revenge when his fiancée is brutally murdered by a psychopathic murderer, Jang Kyung-chul (Choi Min-sik).
 The line between good and evil begins to blur when the two play a dangerous game of cat and mouse.
 "I Saw the Devil" made its premiere in the United States at the 2011 Sundance Film Festival and had a limited U.S theatrical release.
Deranged () is a 2012 South Korean science fiction thriller film starring Kim Myung-min, Kim Dong-wan, Moon Jung-hee and Lee Ha-nui.
 Korea's first film on an infectious disease epidemic, it was directed by Park Jung-woo, and produced by Lim Ji-young and Oz One Film.
 Distributed by CJ E&M, the film was released on July 5, 2012 and runs at 109 minutes.
Kim Yool-ho (; born February 21, 1985) is a South Korean actor and model, He is best known for his role in "The Map Against the World", in which he played Prince Geumwi, and the 2016 zombie thriller apocalypse film "Train to Busan" as "man in suit 2", who helps Yong-suk (played by Kim Eui-sung).
Monster is an upcoming South Korean period thriller film directed by Heo Jong-ho.
 It stars Kim Myung-min, Park Hee-soon, Lee Geung-young, Choi Woo-shik, Park Sung-woong, Kim In-kwon and Lee Hye-ri.
Kim Eui-sung (; born December 17, 1965) is a South Korean actor.
 He starred in film such as "Office" (2015), "" (2015), "Train to Busan" (2016) and "The Truth Beneath".
 He also appears in the TV series "W" (2016).

Question: Kim Eui-sung starred in what thriller film directed by Lee Kyoung-mi?
Answer: The Truth Beneath