Becoming a life winner from infancy - Chapter 566 - 449 is very close to the answer

A man was transported to Ancient China and eventually became a servant of a declining household without a male heir. He utilized his wits and modern knowledge to help the household and eventually become trapped in the sea of political turmoils of the period.

- Description from Novelupdates

What could be worse than getting married to a demon prince as a human princess for a forced truce?Being in a place surrounded by demons was like a nightmare to Aelin. Demons and humans have always despised each other after all. But things only go downhill, when her husband leaves her shortly after they spend a night together to go fight a war with unknown beings which leaves Aelin at the mercy of her enemies

|| To all the readers who are grieving over Caelestis Lanister’s death. I deeply apologize but this character always deserved death in my eyes of justice. Although he was a good leader, a good friend, probably a good son, yet he was never a good friend or boyfriend to Stella.Even after going through all his sins, if you still sympathize with him. I have an offer for you.Would you like to change the destiny of Caelestis Lanister?Yes/No||A translucent blue window appeared in front of Eleanore, who had just opened her eyes in a strange white place, after meeting her end in a Traffic accident.Eleanore finds herself in a new world, with a mission to change the destiny of her favorite character from a book she had recently read, “Revenge is her only desire.”Tired from her daily struggles, she was ready to venture into a new life of the rich, but to her dismay. She finds herself in the body of the villainess that dies in the first chapter of the novel, who shares the same name as hers, Eleanore Sinclair.Moreover, the day she enters into her body is the day she gets killed by Caelestis for harming his lover, Stella.Eleanore binded by the system that guided her through in her mission of changing Caelestis’ fate, realizes that the system favoured Stella over her. She struggles to keep herself alive, while working on Caelestis and Stella's relationship.As she tries to save Stella from the obsessive grasps of Caelestis, she finds herself getting entangled with the notorious villain. As tension and hatred between them rises, a love blooms between them which gives nothing but pain in return.The male lead being her own brother, will she be able to save Caelestis which is no longer her mission but her love?_______“Lies!” he spat again, his voice rising. “I will kill you, Eleanore. If you ever try to do that to her again, I will kill you.”His words cut through her, burning with hatred and fear. Anger surged within her as she fought against him. She had never intended to hurt Stella, not once. The blame lay with the original owner of the body, not her. Why must she listen to these accusations?“I have no such intentions!” she shouted at his face, gasping to find breath. “Let me go!”Her foot lashed out, kicking him in the thigh, but he quickly pinned it down as well. Exhausted from her useless struggles, Eleanore realized she had to gather her strength and then perhaps bite off some skin from his handsome face.“You are just an obsessed man,” she snarled. “You don’t know how to treat a woman. You’re killing her!”Before she could finish, Caelestis silenced her with a violent grip around her throat. His hand tightened around her neck, cutting off her breath.Her wrists were free, but now her neck was caught, and every breath became a struggle. Panic surged through her as she struggled to find, her nails digged deep into at his arm in a desperate attempt to free herself.Caelestis’ true nature had finally appeared in front of Eleanore, and it scared her. She had already been afraid of him, but now the fear felt like it was gripping her very soul.

Klein’s greatest wish is to transmigrate to another world and live life in an isekai, just like in anime, manga and novels. However, fate is on his side and the typical truck that the main characters always carry in isekai runs over Klein. But, to his bad luck, he lived a few more days in the hospital and, just on the day he died, Klein heard a ⟨⟨-DING-⟩⟩ that he knew it meant. That was the day of his death, but also the beginning of his adventure into another world.