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My analysis: the orange band does not reach the costa of the forewing; margins of the orang band are irregular and jagged; a female as the palpi is a blob
1. https://i.postimg.cc/47hwG2jb/Koruth...lvet-Bob-8.jpg
2 https://i.postimg.cc/nXj1BPh8/Koruth...et-Bob-15b.jpg
In these two shots it is difficult to see the length of the palpi 3rd segment.
The orange band falls short of the margins at both ends.
K. rubecula: Palpi 3rd segment long;; orange band typically not reaching costa or tornus in male, in females highly variable.
Upperside FW band with the outer margin convex without an indentation.
http://yutaka.it-n.jp/hes/91510001.html
Typical male.
https://www.learnaboutbutterflies.co...ula%20002a.jpg
Female
;Note palpi 3rd segment is long.
http://www.flutters.org/home/photoga...yotigogoi_.jpg
https://c1.staticflickr.com/1/981/41...4174e186_b.jpg
https://www.jamiun.com/wp-content/up...9watermark.jpg
https://www.thaibutterflies.com/wp-c...s-rubecula.jpg
K. sindu.Palpi 3rd segment very short. Upperside FW orange band with an indentation in the middle of the outer margin.
http://yutaka.it-n.jp/hes/91530001.html
Females.
http://4.bp.blogspot.com/-6RkAaBJ000...alos+sindu.jpg
https://www.thaibutterflies.com/wp-c...os-sindu-1.jpg
Image 1 K. rubecula.
The orange band does not reach the costa.
The palpi 3rd segment is pointed , its length is hard to gauge.
Compare with the rounded knob-like palpi 3rd segment in K. sindu below.
http://4.bp.blogspot.com/-6RkAaBJ000...alos+sindu.jpg
Image 2. K. sindu male.
Although this looks like it should be K. rubecula two features indicate it is K. sindu.
1. The orange is strongly indented in the outer margin.
2. The palpi 3rd segment are totally invisible meaning they are very short & flat.
This male is the same as the one from Chanthaburi below.
http://yutaka.it-n.jp/hes/91530001.html
TL Seow: Cheers.
Thank you so much for the info, Dr Seow!