How to get a bad ending?

How to get a bad ending?

Everything is very simple here. You can kill all enemies, and it is also optional to fulfill the requests of the NPC. When you commit bad deeds, the screen will turn black and white for a second.

What will happen (bad ending)

Attention, spoilers! In search of a cure for Anna in the Dead City, Artem and Melnik die from radiation. The game ends with their funeral. Anna remains alive, but she still cannot forgive Artyom for leaving her alone.