Translation of "Mirage" in Korean

Which makes me think it was definitely a mirage.

신기루였던 게 확실한 것 같아요

And that just makes me a little bit suspicious whether maybe, the oasis is really a mirage.

그래서 어쩌면 저 오아시스가 신기루일지도 모른다는 의심이 드네요