One of the earliest decisions players will make in STALKER 2: Heart of Chornobyl is whether to help Zhorik deliver supplies to a group of his friends. Almost immediately after completing the tutorial, players will encounter a friendly NPC named Zhorik – although he appears to be hiding something. He asks you first to help out some friends of his at a nearby post office, which is under siege, and then directs you onward to his friend Gloomy, whom he hasn’t heard from in a little while. He’s starting to get worried.

https://screenrant.com/stalker-2-help-gloomy-dangerous-visitors-post-office/