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- Movie: Innocent Thing (English title) / Thorn (literal title)
- Revised romanization: Gashi
- Hangul: 가시
- Director: Kim Tae-Gyun
- Writer: Lee Sung-Min
- Producer: Hong Ji-Yong, Kim Tae-Gyun
- Cinematographer: Jung Han-Chul
- Release Date: April 10, 2014
- Runtime: 117 min.
- Genre: Suspense-Thriller
- Distributor: Invent D
- Language: Korean
- Country: South Korea
Joon-Ki (Jang Hyuk) is a popular P.E. teacher at a girl's high school. He is married to Seo-Yeon (Sun Woo-Sun) who is expecting their first child imminently.
During swimming class, a student named Young-Eun (Jo Bo-Ah) climbs up to the highest diving platform and jumps into the swimming pool. Joon-Ki jumps into the water and saves her. Days later, Joon-Ki is leaving school on a rainy late afternoon and runs into Young-Eun who is completely drenched. Joon-Ki takes Young-Eun back into school to change clothes. They spend time together in a classroom, with Young-Eun behaving in an flirtatious manner. Soon, Joon-Ki's marriage to Seo-Yeon is threatened.
- Filming began September 14, 2013 at Jijok Middle School in Daejeon, South Korea. First scene filmed involves gym teacher Joon-Ki (Jang Hyuk) staying after school, because of a sudden rain storm. At that time, a female high school student, who is wet, suddenly runs into the school.
- Filming finished November 10, 2013.
- Early working title was "Ddalgi Wooyoo' (literally "Strawberry Flavored Milk").
- Actor Jang Hyuk previously worked with director Kim Tae-Gyun in 2001 movie "Volcano High".
Additional Cast Members:
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