In the past two years, Se-step-sister hee's Tae-yeon, who used to be a good swimmer, killed herself in a swimming pool by accident. She goes to a study camp at school with 30 other high-achieving students during the summer. First night, Se-hee finds a riddle written on the desk and soon sees a dead girl's body hanging upside down. Then the TVs come on, and the students watch as another friend is hit by his bike in the hallway. Since then, when they don't answer the questions in the time they're given, they get killed. There's still a lot of confusion about why Tae-yeon killed herself. Terrified students are fighting for their lives to figure out the puzzle before they become the next person to die.
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In the past two years, Se-step-sister hee's Tae-yeon, who used to be a good swimmer, killed herself in a swimming pool by accident. She goes to a study camp at school with 30 other high-achieving students during the summer. First night, Se-hee finds a riddle written on the desk and soon sees a dead girl's body hanging upside down. Then the TVs come on, and the students watch as another friend is hit by his bike in the hallway. Since then, when they don't answer the questions in the time they're given, they get killed. There's still a lot of confusion about why Tae-yeon killed herself. Terrified students are fighting for their lives to figure out the puzzle before they become the next person to die.
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