-더니
and then (after observing)
TOPIK 3Reports a change after an observed past fact: 'and then ~'.
Examples from real articles
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그런데 갑자기 무대에 불이 꺼지더니 관계자들이 그 가수를 무대에서 쫓아냈습니다.
But suddenly the lights on the stage went out, and then the staff chased the singer off the stage.
Japanese Performers Forced Off Stage in China →
Read these lessons
Articles that use -더니 in context — open one to read it in full.