I Became the Villain Saintess's Slave

Born blind and stripped of his family's swordsman legacy, Lucian Sarnel has spent his life as the Sarnel family's forgotten failure. But when a suspicious act of “healing” from the Empire's revered Saintess stirs something within him, a mysterious power awakens from the eyes everyone believed were forever blind. What he uncovers is terrifying: the Saintess everyone reveres as pure and holy harbors a dark obsession, and Lucian may already be her next target. Guided by a Creatures only he can see, Lucian must uncover the Villain Saintess's secret before he loses his freedom forever—all while broken engagements, imperial politics, and dangerous attention from powerful figures close in around him. — Description from novelcodex.org