Korean phrase
그렇게 할걸. keu reo ke hal kkeol
Meaning
I should have done that
When to use it
It expresses regret about not doing what was suggested. It is used after an event when following the advice would have been better.
Example dialogue
발표할 때 천천히 읽으라고 했지? pal pyo hal ttae cheon cheon hi il geu ra go haet jji
You told me to read slowly during the presentation, right?
응, 그렇게 할걸. eung keu reo ke hal kkeol
Yeah, I should have done that.