Reincarnated as a demon inside a dungeon - Chapter 3

After transmigrating into a weak noble body, Marvin discovered that he was familiar with the world, this was the game he played in his previous life and… Damn! He only had six months before the Great Calamity!

A world with magic, mythical creatures, mystical herbs, labyrinths, and treasures.A world where the strongest adventurers get to be the ones to enjoy fame and riches.A world where various rankings decide your worth.This is the world where Shye Crowley and his sister were born.As the children of two fairly known diamond-ranked adventurers, Shye and his sister, Maia, enjoyed a prosperous lifestyle.Unfortunately, after departing for a mithril-ranked quest in hopes of ranking up, their parents couldn’t return.Years passed and life went downhill fast for the siblings.Fortunately, a fateful encounter bestows him a system that could change their fate.

Zhong Yuhuan had transmigrated into a book and became the female supporting character who was destined to die an untimely and tragic death. Coincidentally, her family adopted two boys — the male lead and the villain of the book!

The male lead of the book would become a superstar in the show business and the villain a super successful and powerful businessman.

Zhong Yuhuan thus began her life of raising the male lead and the villain while faceslapping other scums. She would grow up quickly and live the life of the rich and powerful Mary Sue!

- Description from Novelupdates

Ryan «Quicksave» Romano is an eccentric adventurer with a strange power: he can create a save-point in time and redo his life whenever he dies. Arriving in New Rome, the glitzy capital of sin of a rebuilding Europe, he finds the city torn between mega-corporations, sponsored heroes, superpowered criminals, and true monsters. It’s a time of chaos, where potions can grant the power to rule the world and dangers lurk everywhere.