I found the following sentence in Duolingo:
Due to recent sound changes, 애(얘) and 에(예) are pronounced the same in most Korean dialects.
However, according to Wikipedia Korean IPA article, the former is [ɛ] while the latter is [e].
I wonder in which dialect they are pronounced the same and in which differently.
Also, how is it treated in Seoul?
And finally, if they are both pronounced the same, how can Koreans distinguish them based solely on hearing them?