The killing of a classmate by a man in black may be a sign of inner conflict and anxiety.
Men in black represent the danger and fear in the dreamer's heart.
This man in black is both familiar and unfamiliar, and the dreamer can make good associations in a quiet environment, and perhaps find out related events.
Classmate, it should be the dreamer's own projection.
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Novice, unprofessional, confused, watching Lele.