-기가 무섭게 means "as soon as" with emphasis - instant reaction.
Immediate - 문 열기가 무섭게 뛰어나갔다 (ran out the instant the door opened)
No delay - Action follows immediately
Emphatic - Stronger than -자마자
Literally "scary to even V" - So fast its startling
More dramatic than -자마자
As soon as I arrived, I started working.
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