For the Happy Ending of the Tragic Novel

Reading For the Happy Ending of the Tragic Novel manhwa, For the Happy Ending of the Tragic Novel manga with alternative name: For the Happy Ending of the Waste / For a Pushover’s Happy Ending / 피폐물의 해피엔딩을 위하여 with Description: In [The Miracle of Dawn], a regrettable novel with male protagonists resorting to any means to claim the priestess ‘Bell,’ it seems as though I was possessed. I believe my reincarnation as Rosiana is an impediment to the protagonist’s joy. Is it possible for me to modify the novel’s conclusion?