亡羊补牢
to mend the pen after the sheep are lost; better late than never
HSK 7-9
Pronunciation
wángyáng-bǔláo
Example sentence
虽然项目出了问题,但亡羊补牢,我们现在改进流程还来得及。
Although the project had problems, it's better late than never — we still have time to improve the process now.