zǎo zhī jīn rì hè bì dāng chū
if I (you, she, he...) had known it would come to this, I (you, she, he...) would not have acted thus (idiom)
to regret vainly one's past behaviour
zǎo zhī jīn rì hé bì dāng chū
if I (you, she, he...) had known it would come to this, I (you, she, he...) would not have acted thus (idiom)
to regret vainly one's past behavior