It is a Pyrrhocoridae, but not Dysdercus cingulatus and not Dysdercus sp.
I found similar species.
Serrineta abdominalis:
http://pikul.lib.ku.ac.th/insect/007-013%20INSECTS%20of%20Thailand/012%20Thai%20Insect%20Families/Pyrrhocoridae/Serrineta%20abdominalis.jpg
Antelochus sp:
http://pikul.lib.ku.ac.th/insect/007-013%20INSECTS%20of%20Thailand/012%20Thai%20Insect%20Families/Pyrrhocoridae/Antelochus%20sp.%20Depinned.jpg
Do not ask me how to separate them and if the ID is correct.
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