When the waitress was drinking in the bar, she said it was my treat. What was written on the paper?

"Red Circle"-The red circle is the club where the boss puts his son in the film.

By the way, their bar is the bar of the killer hotel. The whole killer hotel is a huge and authoritative behind-the-scenes organization. On the one hand, it can be seen from the efficiency of obtaining information by all parties. On the other hand, there are strict rules, one of which is that no one can kill anyone in the hotel (all the rooms in the hotel are big windows, which feel intentionally open), but the club where boss lets his son go (the red circle club) has no such rules, and John can be in it.