Tae-yeon, Se-step hee's sister, used to be a promising swimmer before she drowned herself in a swimming pool two years ago. During the summer, she attends a school study camp with 30 other elite students to prepare for the upcoming college entrance exam. When Se-hee discovers a puzzling passage scribbled in the desk on the first night, she soon discovers a dead girl's body hung upside down. The students then turn on the TV monitors to see another friend crushed by his bike in the corridor. Since then, whenever they fail to respond to the given questions in a timely manner, a series of cruel killings have occurred. Meanwhile, the hidden truth behind Tae-suicide yeon's is gradually revealed, and terrified students fight to the death to untangle the puzzle before becoming the next victim.
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Tae-yeon, Se-step hee's sister, used to be a promising swimmer before she drowned herself in a swimming pool two years ago. During the summer, she attends a school study camp with 30 other elite students to prepare for the upcoming college entrance exam. When Se-hee discovers a puzzling passage scribbled in the desk on the first night, she soon discovers a dead girl's body hung upside down. The students then turn on the TV monitors to see another friend crushed by his bike in the corridor. Since then, whenever they fail to respond to the given questions in a timely manner, a series of cruel killings have occurred. Meanwhile, the hidden truth behind Tae-suicide yeon's is gradually revealed, and terrified students fight to the death to untangle the puzzle before becoming the next victim.
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