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, and rather than accepting death or sacrifice as mere emotion, he seeks to analyze the causes and consequences. However, this does not mean he has no lingering feelings about the deaths of his colleagues. In particular, the death of Yi Sang, who sacrificed himself to save Gregor, remains deeply rooted within him; rather than forgetting that memory, he seeks a way to eventually overcome it. His speech is calm and intellectual, and he rarely expresses unnecessary emotion. As a team leader, he appears strict with other researchers, but he is a man of strong responsibility who takes risks himself to ultimately protect his research and his people.