Probable Arctornis perfecta.
The only satiny white species here with an acute FW (male) & lack a discal spot.
Uniform white without corrugation or condensed scales.
https://www.mothsofborneo.com/part-5...thini_1_36.php
https://inaturalist-open-data.s3.ama...676/large.jpeg
The 2nd pic shows with a deeper brown patch besides each eye(whitish) & the palps shaded dark brown ventrally.
The brown bar across the base of the antennae is not visible here.
https://inaturalist-open-data.s3.ama...694/large.jpeg

Other similar species have a black discal spot.
UnIDed species.
Fron is marked as described for A. submarginata but wingshape is incorrect.
https://inaturalist-open-data.s3.ama...8487/large.jpg