Question: The youngest member of Girl's Day stars along with which other actor in the upcoming South Korean film Monster?

Context articles: Monster (2017 film)
Fromis
I Want to See Your Parents' Face
The Accidental Detective 2
Kim Su-ji
Lee Hye-ri
Man of Will
Seungri
Cheese in the Trap (film)
GP Basic

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.
Fromis (; initialism for From Idol School; stylized as fromis_) is an upcoming South Korean girl group formed by CJ E&M through the 2017 reality show "Idol School" on Mnet.
 The group is composed of nine members: Roh Ji-sun, Song Ha-young, Lee Sae-rom, Lee Chae-young, Lee Na-gyung, Park Ji-won, Lee Seo-yeon, Baek Ji-heon and Jang Gyu-ri.
 The group's name, pronounced as "promise" in Korean, also means "to keep their promise [to viewers] to be the best girl group".
I Want to See Your Parents' Face is an upcoming South Korean film directed by Kim Ji-hoon and based on a play by Seigo Hitazawa.
The Accidental Detective 2 is an upcoming South Korean film sequel to Kim Jung-hoon's 2015 film "The Accidental Detective".
 The film is directed by Lee Eon-hee.
Kim Su-ji (born 16 February 1998) is a South Korean diver.
 She competed in the 10 metre platform event at the 2012 Summer Olympics.
 The youngest member of the South Korean contingent at the Olympics that year, she lives in Ulsan, where she graduated from Guyeong Primary School and went on to Cheonsang Middle School.
 She won a bronze medal along with Cho Eun-Bi in the women's 10 metre synchronised platform event at the 2013 East Asian Games in Tianjin.
Lee Hye-ri (born June 9, 1994), better known mononymously as Hyeri, is a South Korean singer and actress.
 She is the youngest member of girl group Girl's Day and is known for her leading roles in television dramas "Reply 1988" (2015) and "Entertainer" (2016).
 She ranked third in "Forbes" Korea Power Celebrity list in 2016.
Man of Will is an upcoming South Korean film directed by Lee Won-tae, starring Cho Jin-woong and Song Seung-heon.
Lee Seung-hyun (Hangul: 이승현; born December 12, 1990), better known by his stage name Seungri (Hangul: 승리, "Victory") and V.I when performing in Japan, is a South Korean singer, songwriter, record producer, actor, and entrepreneur.
 In the mid-2000s, Seungri rose to prominence as one of three vocalists and youngest member of the South Korean boy band Big Bang under YG Entertainment, which eventually became one of the best-selling digital group of all-time in Asia and one of the best-selling boy bands in the world.
 With the release of the group's second studio album "Remember" (2008), in which the second single released, "Strong Baby", was performed solely by Seungri, he began to adopt a more mature image as an artist.
Cheese in the Trap () is an upcoming South Korean film starring Park Hae-jin, Oh Yeon-seo and Park Ki-woong.
 It is based on the Korean webtoon of the same name.
GP Basic (Korean: 지피 베이직 ) was a South Korean girl group who debuted on August 15, 2010.
 At the time of their debut, they were considered to be the "youngest" South Korean girl group with an average age of below 13.5.
 The age of their youngest member, Janey, caused controversy followed by the debut of a much younger girl group, G-story, who were all below 10 years old.
 This led to new broadcasting regulations in South Korea.