Description:

Suddenly, holes called 'black circles' began to appear in the world. The black circles were a mystery in and of themselves. No one could explain why they appeared or what was inside. Except that no one has ever returned from falling into a black circle. One day, a black circle appeared at the main character Do-Yoon's school. The black circle grew bigger and bigger, engulfing the school, and most of the students, including Do-Yoon, fell into the black circles. Will the children be able to find the exit and escape the black circles? (Source: Naver, translated)

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