Agree with Lymantria singapura.

Not sure about which specie of Berta, though - there are three species in Hong Kong, including zygophyxia, none of which are easily told apart. Could be right, though, as there appears to be too much white mottling on the tornus of the hindwing and along the termen of the forewing for it to be Berta chrysolineata.

cheers,

Roger.