MTL - Spiritualist In Korea - Chapter 3 The treatment of the protagonist?

Cassian Ven Dyke, the bastard son of a powerful ducal family, grew up in the slums of Veldora under the care of his father figure, sword master Russel. When Russel passed away, Cassian was left with only a silver necklace as his inheritance. After putting it on, Cassian was attacked by three psychotic thugs who tortured him in an attempt to steal the necklace. Refusing to give in, Cassian was ultimately stabbed through the heart with the very same necklace. Instead of dying, he mysteriously vanished as the necklace lodged itself in his heart. Just before disappearing, he heard an eerie message echo in his mind:[True mana detected. Origin: Human...][Human detected. Compatibility with system: Confirmed.]

In a world fractured by conflict and haunted by shadows of the past, Kokushibo—the first Upper Moon demon—meets his end, only to awaken in a new life. Reincarnated as Crimson, a child born into a different family, he carries the memories of a past he cannot escape. Burdened by centuries of guilt yet indifferent to the present, he resigns himself to duty—until an unexpected bond with his newfound family begins to thaw his hardened heart. As he struggles between the weight of his past and the weight of the new life, Crimson must decide whether he will remain shackled to his former sins or embrace the possibility of peace.

-Daughter? Yes!-Multiple worlds? Yes!-Vast Lore? Yes!-Fastpace? Yes!...“You either Die a Villain or Live long enough to see yourself as a Hero.” ~Probably Spark---------------------------------------Spark, the lofty young master of the Dwight family, had always been a mystery. His true abilities were never known until the day he stepped onto the frontlines.In one awe-inspiring exhibition of power, Spark shocked the world and sent the coalition army of the five emperors into a chaotic retreat.Now, with the eyes of the world on him, each faction lusted to uncover the secrets behind his unparalleled strength.Still, in spite of the rampant curiosity and greed, nobody had the guts to confront him directly.And with every rumor spread of his feats, a question burned in every mind: was Spark this powerful all this time, or was he casting an illusion of strength before everybody's eyes?

Sequel of Allison, taking place about 17 years after the original series.