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I wonder if this is Ablabesmyia longistyla.

the gonostylus is not longer than the gonocoxite but it is even in length. vide attachment photo

I do not think that it matches A. monilis and i don't have drawings of A. phatta or A. peleensis. I see drawings for A. longistyla and A. monilis in a pdf entitled "Revision of the Genus Ablabesmyia in Korea".