Vilem was born and raised in Berezino. His father was killed by nationalists during the civil war for working for a Russian employer before the war. His mother was also killed for marrying a man who could work for the Russians.
Vilem was forced to work for Chedaki forces as a spy during the civil war but eventually left the country to avoid being killed by nationalists after he was snaked out by kids on his block. He spent many years living in Russia, and briefly joined Chechen paramilitary forces to fight the West during the Arab Spring. He returned to South Zagoria to search for the nationalists responsible for the deaths of his parents.
After the outbreak of the infection, Vilem made camp at a hunting cabin and spent most of his time scouting the area and improving his small shelter. The cabin was eventually overrun by infected and he was forced to leave. He ventured north in to the Black Mountains to try and find information from the Chedaki about the nationalists responsible for the deaths of his family members. After making contact, he began scouting down in to South Zagoria and working as a mercenary to gather information about the current state of Chernarus.