There are some people that always make me smile when I see them. Because just seeing them makes me happy.
I remember one of those was a girl who was taking dancing lessons in the same group with me, and one day, when I said, "I'm happy to see you," she replied, "You always say that". I thought about that for a moment, and then said, "That's because I am always happy to see you." As in, every time I see her, that makes me happy. It wasn't just something I said to her.
It's nice to have people around you who can put a smile on your face just by being there.