Entity class not working on 2 module

hi all,

i recently implement entity to my project, i successfull setup it to work with the backend module, but when i call that model in the frontend module, it does not return an entity object, i return the normal object. Here is my project structure and code

my folder structure 


when i run and debug the code in acp module

as you can see, i got my post item return successfully in entity object

but when i call it in my site module

it does not return entity object but a normal object, does any one have this problem? or i missing something?