4th Period Mystery

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4th Period Mystery
4th Period Mystery poster.jpg
Theatrical poster
Hangul4교시 추리영역
Revised Romanization4Gyoshi Churiyeongyeok
McCune–Reischauer4Gyosi Churiyǒngyǒk
Directed byLee Sang-yong
Produced bySeo Myung-jin
Written byShin Jai-ho
StarringYoo Seung-ho
Kang So-ra
Music byYozoh
CinematographyMoon Ho-jin
Edited byKyung Min-ho
Sway Entertainment
Distributed byLotte Entertainment
Release date
  • 12 August 2009 (2009-08-12)
Running time
86 minutes
CountrySouth Korea
Box officeUS$360,944[1]

4th Period Mystery (Korean4교시 추리영역; RR4Gyoshi Churiyeongyeok), released internationally as The Clue, is a 2009 South Korean thriller film starring Yoo Seung-ho and Kang So-ra.[2][3]

It was released on August 12, 2009 and drew a total of 67,602 admissions.[4]


Jung-hoon (Yoo Seung-ho) is the best student at his school. His rival, Tae-gyu (Jo Sang-geun), takes any and every opportunity to knock him down both verbally and physically, and the two are known enemies amongst the other students. One afternoon Tae-gyu pushes Jung-hoon too far and the latter threatens Tae-gyu with a knife, an act that's witnessed by another student. Jung-hoon walks away from the situation, but shortly after the beginning of 4th period class he returns to find Tae-gyu dead. The boy has been stabbed repeatedly, and still in shock, Jung-hoon picks up the bloody knife off a nearby desk just as Da-jung (Kang So-ra) shows up, catching him in a most incriminating position. Fortunately for him, she not only believes his innocence, but offers to help him to solve the mystery and catch the real killer – a task made particularly urgent by the fact that in 40 minutes the rest of the class will return and the body will be discovered. The pair set out in search of the murderer and soon discover that just about everyone’s a suspect and even more unsettling, the murderer is now after them as well.



  1. ^ "4-Hour Mystery Zone (Sagyosi Churiyoungyeok / Clue) (2009)". Box Office Mojo. Retrieved 23 January 2015.
  2. ^ Mudge, James (24 November 2009). "4th Period Mystery (2009) Movie Review". Beyond Hollywood. Archived from the original on 29 June 2011. Retrieved 19 May 2012.
  3. ^ Hunter, Rob (10 March 2010). "Foreign Objects: 4th Period Mystery (South Korea)". Film School Rejects.
  4. ^ "Theatrical Releases in 2009: Box-Office Admission Results". Koreanfilm.org. Retrieved 17 October 2014.

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