Lesser Grass Blue

Hod not noticed before but yes, the hind wing has a V-shaped bit missing and I thought it was a dark spot! I looked at the full size picture and it is quite clear. This is a valid species in Singapore so I assume it is in West Malaysia also.

Lycaenidae, Polyommatinae, should be Zizina otis, assuming the dark spot is actually a damage on the hindwing with showing the dark part of the forewing. Please, verify!