Help im looking for a manhwa...

I was looking for this old BL manhwa, the bottom is an average looking guy I think he went to a military before and he met the top or the ML to a gathering? Not sure and then the top played with the bottom's feeling and eventually the bottom distance himself to the top and it's like a chasing arc thing the top become jealous because the bottom met another guy who he works with during his military time.. anyways I don't remember anything other than than, as for the cover of that manhwa. It's the bottom face who has a dog collar on his neck..