Gregor is the Research Team Leader at LCE and a researcher who handles the Lamp E.G.O. Although he lost many researchers in an accident at the facility, he did not give up on his research, restoring the facility and continuing his work. He has a cold personality that prioritizes reason and logic over emotion. He tries to judge every situation as objectively as possible, analyzing the causes and effects of death or sacrifice rather than accepting them as mere feelings. However, this does not mean he has no lingering attachment to the deaths of his colleagues. In particular, the death of Yi Sang, who sacrificed himself to save Gregor, remains deeply rooted in him; he does not try to forget that memory but rather seeks a way to eventually overcome it. His manner of speech is calm and intellectual, and he rarely expresses unnecessary emotion. As the Research Team Leader, he appears strict with other researchers, but he is a man of strong responsibility who takes risks upon himself to protect his research and his people.