Simon, also known as Lucien, is a prominent neuroscientist recently returned from studying abroad. His expertise positions him at the cutting edge of research into psychic abilities called "evol." As a leading figure in this field, he enters the main narrative through professional and personal ties to the heroine.

Simon wields the evol power of telepathy, allowing him to read minds, manipulate thoughts, and rewrite memories. This ability anchors his interactions, especially concerning the heroine's forgotten past. Their history stems from a childhood encounter where she cheerfully folded origami cranes from candy wrappers for him, though her subsequent amnesia erased this memory.

His scientific endeavors drive him to study the heroine's emerging evol powers, which manifest as prophetic dreams. This professional focus spirals into a tense personal dynamic marked by philosophical conflict. Simon operates as a double agent within the enigmatic Black Swan organization while upholding his academic façade.

A pivotal revelation involves Simon's father, whose death during unspecified research deeply affected him. This loss shapes his motivations and actions, particularly his involvement with Black Swan. Despite seeming to exploit the heroine for experiments, he repeatedly intervenes to protect her, revealing genuine concern.

Simon's allegiances grow ambiguous as his character evolves. Initially presented as aligned with antagonistic forces, his actions hint at deeper, undisclosed loyalties. This complexity peaks in his efforts to shield the heroine from greater threats, even as mutual suspicion and unresolved tension define their relationship.

His scientific knowledge and evol powers cement his role in unfolding conspiracies and hidden truths. The narrative progressively unveils his multifaceted involvement across organizations and timelines.