Toaru Majutsu no Index - Volume 18, Afterword

He rose from hardship, but was felled by betrayal. From then on, one man, one gun; treads the path between Evernight and Daybreak to became a legend. No matter what was destined to be his fate, he intends to become the ruler who dictates.

In the realm of immortal cultivation, Lu Changsheng traversed as a peasant youth, overlooked by a celestial sect. Yet, endowed with the Multitude Progeny System, he could earn rewards by propagating his lineage, nurturing offspring.Thus, Lu Changsheng began his journey by marrying into a cultivation family, embarking on a path of intrigue, networking, and fostering descendants to expand his family’s cultivation legacy.As the cycles of time passed and epochs changed, countless supreme beings in the realms of immortality, formidable figures in the demonic path, revered saints among the demon races, and peerless beauties rose and fell, fading into the river of years.Only Changsheng’s family endured, immutable through the ages, perpetually existing, towering atop the path of immortality, sharing longevity with the heavens and earth, radiating brilliance akin to the sun and moon.

The Capital’s girls look on with hatred, “ You’re just a country girl without any knowledge. Do you have Cloud Shop’s clothes? Do you have Brilliant Treasure Pavillion’s jewellery? Do you even know how eminent and domineering the famous Yue Wang is?

One day, Luo Jian woke up from his sleep and found himself in a locked chamber where the door and window were all sealed. A note with a few lines written on it was tacked to the wall: “Escape from this room within an hour, otherwise, you will die.”

There is a sequel called Reincarnation Night (轮回之夜) that takes place in the same universe but has different main characters

- Description from Novelupdates