During fourth period, high schooler Da-jeong finds her classmate Tae-gyu dead in a classroom and Jeong-hun standing in front of him with blood on his clothes. In order to stop Jeong-hun from becoming the prime suspect, Da-jeong must help him find the real murderer, who is still inside the school building, under 40 minutes before period four ends.
Director : Sang-yong LeeCast : Im Soo-hyang|Jeon Jun-hong|Jeong Seok-yong|Jo Yun-hei|Kang So-ra|Kim Dong-beom|Lee Chan-ho|Rie Young-zin|Sang-geun Jo|Yoo Seung-ho
Genre : Horror
Release Date : 2009-08-12
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