It seems to me that the young man in the bathroom was recently not very well off (which is why the flat is bare and scruffy). But he became very rich by winning the lottery which is why he has jewellery, a big tv and is considering buying a Ferrari.

Maybe some nasty villains knew of his new-found wealth and tied him to up to rob his flat. Maybe they knew about the stag party they thought he’d be going to.

I like the way the place tells the story… and I’d love to discover the solution to the mystery.