A central idea is the main subject matter of a story or narration that holds the other details together.
Therefore, from this brief narration given, the experience of a frightened boy Ja-bae-ka is told and how his friends pranked him and how scared he was about everything.
As a result of this, the central idea would most likely be "Fright and its effects" because Ja-bae-ka was scared by his friends and as a result, he cried out in terror and ran away.
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