A man born incapable of feeling love crosses paths with a woman who no longer believes in it. Kwon Chae U, the brilliant yet psychopathic heir to a powerful conglomerate, has lived his life without understanding human emotion. So I Yeon, a devoted arborist who sees love as nothing more than a beautiful illusion, unexpectedly becomes entangled with him. As their lives intertwine, the impossible begins to happen: the man who cannot love starts to change, while the woman who has closed her heart is forced to confront feelings she thought she'd left behind. Together, they embark on an unexpected journey to discover whether love can exist even for those who believe it never could.