Scientific name: Zographetus doxus
These are forest-dependent butterflies and are rarely, if ever, found outside the sanctuary of the nature reserves in Singapore. source: https://butterflycircle.blogspot.com/2017_04_22_archive.html
ID from Dr Seow : Zographetus doxus Female
Males are identified by their large white area on the antennal clubs.
Zographetus doxus.
Ground with a more yellow bloom in the discal (central) HW area.Margins broadly brown. Outer half of HW cell paler , yellower than inner half. HW veins are noticeably darkened.
Thanks Koh Cher Hern for helping for the ID