에이! · 에이, 설마 · 에이, 아니에요 (modest denial)
come on, no way, aw (doubt, dismissal or mild disappointment)
Example
에이, 설마 그게 진짜예요?
Oh, come on, is that really true?
Word parts
An interjection of doubt or mild letdown, close to English 'aw, come on'.
Good to know
Also brushes off praise modestly: 에이, 아니에요 'Oh no, not at all.' Stretched 에이~ sounds teasing.
Related words