[LunaTheHamster1]

One thing for when he is out of his cage, have you got anything he can hide under so he feels safe - for example, I have 2 cushions on the floor with one on top so it makes a little den for Luna, she loves cleaning herself under there, i also have used empty boxes, some I just leave as or i flatten them and make them into a tent type tunnel for her to run thru. Basically try and fill up the free space with a few obstacles that provide shelter, see if that helps. Does his cage have places like that too? Are you able to show us a pic of his cage set up? Are there lots of places for him to hide to feel safe?
Maybe just go a little bit slower for him, he's obviously interested in you if he's coming to check you out.