Correct

毁于一旦

/ huǐ yú yīdàn / 
Strokes

Example

Definition

be destroyed in a day/moment; be wiped out overnight

1
Chuí
垂
chéng
成
zhī
之
gōng
功
  
,
kǎi
岂
kě
可
huǐyúyīdàn
毁于一旦
  
。

How can we allow what is soon to be a success to be ruined overnight?