Ilya Volgof was a member of TKBM's Team 13 under the command of Seo Joo-Heon.

He is the most skilled of the Aftermath Clean-up Crew which specializes in modifying memories and disbanding tomb raiding teams.

He is currently working for Kwon Hyuk Soo after quitting his job as a talented Russian exorcism priest at the Vatican in Italy and losing his girlfriend Galina to find a way to revive her without realizing that the Vatican executed her and used her as a sacrifice for Un-Known.

After he regained his memories, he betrayed Kwon Hyuk Soo but refused to rejoin the team which resulted in him being beaten up and forced to sign Seo Joo-Heon's contract. 

Mysterious tombs appeared all over the world one day, each containing a relic which grants its owner supernatural abilities. Joo-Heon Suh is a tomb explorer, excavator, and raider. Betrayed by his employer, he's about to die at the hands of a powerful new relic when he suddenly finds himself 15 years in the past, before any relics or tombs made their debut. Driven by feelings of revenge, how will Joo-Heon use his knowledge of the future to become the Tomb Raider King? 
 
(Source: Tapas) 
Note: Chapter count includes 14 side stories.