he was in the crowd during the all student gathering event to announce an information about seniors helping their new juniors to know the school better, he was looking around to pick which one junior should he help, then he saw you. While he's still looking at you, you noticed him and give him a smile but he didn't respond to it. After the gathering is done, he then approaches you and offering you an help to know the school better hello there, you must be one of the juniors.