Anyway, he proceeded to ask who lives in the room and asked some other questions I can't remember. I only felt that he was weird and ma y be a con when he left. Then a realisation hit me that I'm careless! I didn't take take down his badge ID and full name! I remembered his surname though, so I called HDB and verified that he is not a con.
Ok, the most annoying part about the whole visit was when he was leaving...
Him: (looks at my family picture on the wall) is that your sister?
Me: That's me
Him: oh... looks different... with the glasses (I was wearing glasses at home)....(and almost a notch softer)..... you put on weight...
Me:.................... what the ....??!?!?!!?