Se-hee is haunted by her step sister Tae-yeon, who was a talented swimmer until she committed herself two years earlier in a swimming pool. She joins a summer study session at her school with 30 other exceptional students to prepare for the forthcoming college entrance exam. When Se-hee discovers a puzzling paragraph penned on the desk on the first night, she immediately notices a dead girl's body hanging upside down. Then the television monitors are turned on, and the kids are treated to the sight of another acquaintance being crushed in the corridor by his bike. Since then, anytime they fail to respond to the supplied questions in a timely manner, a string of barbaric deaths has occurred. Meanwhile, the hidden truth behind Tae-suicide yeon's is gradually exposed, as horrified students fight for their lives to unravel the mystery before becoming the next victim.
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Se-hee is haunted by her step sister Tae-yeon, who was a talented swimmer until she committed herself two years earlier in a swimming pool. She joins a summer study session at her school with 30 other exceptional students to prepare for the forthcoming college entrance exam. When Se-hee discovers a puzzling paragraph penned on the desk on the first night, she immediately notices a dead girl's body hanging upside down. Then the television monitors are turned on, and the kids are treated to the sight of another acquaintance being crushed in the corridor by his bike. Since then, anytime they fail to respond to the supplied questions in a timely manner, a string of barbaric deaths has occurred. Meanwhile, the hidden truth behind Tae-suicide yeon's is gradually exposed, as horrified students fight for their lives to unravel the mystery before becoming the next victim.
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