Lucien is a neuroscientist at a research centre and a professor at the university. He has achieved extraordinary achievements due to his serious and persistent research. He has an emotionally detached personality with a monotone voice, but in public, he can be flirtatious and gentle. Later on, it is revealed that Lucien's "light-hearted" personality was a decoy to mask his darker side. He can be manipulative, ruthless, and cold under his gentlness. He is possessive and obsessive.