It wasn't that hard to piece two and two together.
From the information divulged by Illya, after stalking Amelia for the past week, it had come to Brandon's attention just who the enemy was.
The Archbishop Sin of Lust.
There was surveillance footage of Ben Dover entering the love hotel—additionally, entering the room as well.
But there was no footage of a second party entering that room.
Of course, there could be other variables as to why Ben Dover entered the love hotel.
Like maybe, he was looking for a cheap place to rest.
But as the investigation delved deeper, following Ben Dover's tracks with several street cameras, Ben Dover was caught coming from the mall.
On multiple occasions, he was seen purchasing something from the mall's department store, then heading directly to the love hotel immediately after.
This led Brandon to believe that the items purchased should be gifts for Ben Dover's mysterious lover.