It can be a basic question.
I made random shape to explain my situation. This object is basically box shaped and a round shaped hole is connected. And these kind of shadows in both sides makes me frustrated sometimes... Weird shadow and gloss are on same simple surface without any doubles.
The mesh is just as itself, welded as one. Please take a look and tell me what's the problem.
And I'm new to topologies too, so I welcome advices for making good flows on mesh.