Correct

恨事

/ hènshì /
Strokes

Definition

a matter for regret or resentment

Example

As a Noun

matter of regret

1
Dāngchū
当初
méiyǒu
没有
xué
  
,
nǎi
zhōngshēn
终身
hènshì
恨事
  

He considers it his lifelong regret that he did not learn medicine when he was young.