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Koruthaialos rubecula
Forest stream
There are several similar skippers around. But based on the yellow band and its shape and extension I think yours is Koruthaialos rubecula.
http://www.thaibugs.com/wp-content/galle...
Not Gem Demon:
https://www.projectnoah.org/spottings/14...
http://www.projectnoah.org/spottings/243...