Leveling Up Alone - Chapter 437: Island in an Unfamiliar Dimension (6)

A skilled but unfortunate modern-day assassin was killed in a freak accident. However, he soon found himself summoned to another world by an evil wizard, who had him possess the body of a boy as an experiment. After successfully planning the evil wizard’s downfall, he used the wizard’s body as a springboard to gain influence and power in his new world.

- Description from Novelupdates

Lucian Bowcott only wanted a quiet life. He met up with old friends, made a wish, and died after one drink.Now, he awakens inside a coffin—summoned by the Half-Dead Queen of Atraeum and surrounded by restless souls.Armed with the Death Grimoire, Lucian must embalm corpses, repair brittle bones, and help the dead find peace… before something ancient finds him.As his powers grow, so do the whispers in the dark. If he wants to survive, Lucian must unravel the Queen’s grief, discover why a mortician hasn’t been summoned in over a century, and confront the entities haunting his every step.A/N: It doesn't deal with dungeons, Lucian's system is a magical book, and he slowly unlocks powers to help him with his next assignment. He travels to different places around Atraeum, and in the future, another kingdom.This is a character-driven gothic isekai about an introvert learning that sometimes, peace is more than just embalming a body and preparing it for a funeral. He's more of an undead therapist now

For the wine to be drunk on her wedding night to actually have been a cup of poison and for the one to poison her to be her husband, who would believe it?