His clothes would now be something akin to a school uniform. A white shirt with a green jacket with gold trimming, and black pants to match. Either way students were typically allowed to wear normal clothes on fridays through sunday. So even if Shin hadn't altered his appearance Helios wouldn't have noticed much. Still as he makes his way further down the hall he'll smell the airy aroma of vanilla getting stronger and stronger as he goes deeper. The hallway looks like it stretches on endlessly but the walls on either side are lined with doors.

Shin might notice that he's being followed by something then and there. Black seemingly formless phantom like beings that use the castle's walls and floors as their means of travel. They won't do anything as long as Shin doesn't look like a threat at least.