How to trigger a gunman-like task in A $2 Valentine's Hotel?

Triggering conditions: the second chapter begins.

Process description:

You can meet strangers in the Valentine's Day bar. After the story, you need to go to four different locations to find four sharpshooters. Take out the sharpshooter's photo and turn it to the back. The location of the sharpshooter will be directly marked on the map with the corresponding letters. The second part of the task is to go to the position where the four sharpshooters are. Before and after meeting each sharpshooter, you should pay attention to the following points:

1. In addition to the beauty in black, there will be a confrontation with other sharpshooters after the plot, so you need to confirm your weapons and equipment first.

2. Don't forget to pick up the revolvers left by other sharpshooters except the beauty in black. This is the only chance to get these weapons in the game. If you leave for a while and come back, they will disappear. If you just unlock the picture book, you can pick up these weapons at once and throw them away.

Before you leave, you need to take photos of every sharpshooter, get as close as possible, and take their whole bodies into the photos.