Probably a 五斑狹胸步甲 Stenolophus quinquepustulatus?
About 8-10mm in length.
It has 5 oval orange spots on its elytrons

Reference :
http://carabidae.org/taxa/quinquepustulatus-(wiedemann-1823)
A Photographic Guide to Hong Kong Insects 香港昆蟲圖典 1st Edition 2014 P.237 - Hong Kong Entomological Society