Daily Chinese Idiom Guessing Game
It's never too late to fix a mistake or prevent further loss after a mishap.
亡逃亡，丢失；牢关牲口的圈。羊逃跑了再去修补羊圈，还不算晚。比喻出了问题以后想办法补救，可以防止继续受损失。
《战国策·楚策》见兔而顾犬，未为晚也；亡羊而补牢，未为迟也。”
He forgot to lock the door and his bike was stolen. Now he is buying a better lock; better late than never.