Release That Witch - Chapter 20: Nightingale

The mysterious boy Ling Chen is saved by a little girl as he lay on the street dying. Years later, he strikes a deal to save this savior-turned sister and enters the virtual world. In a future Earth where advanced warfare has forced nations to settle issues virtually or else suffer the consequences, Ling Chen bursts into the scene and goes from unknown to legend. Yet all is not as it seems, for Ling Chen has a dark past, and there is a greater mystery at hand behind this virtual world.

To save his terminally ill little sister, Ling Chen enters the newly released virtual game world and joins a small gaming studio comprising entirely of women. From now on walking upon his path towards the pinnacle. An ancient, evil item almost forgotten by history, the “Lunar Scourge” helps forge his unsurpassable legend, and causes him to unknowingly step upon a path that is destined to be punished by the heavens, the way of the Shura.

- Description from Novelupdates

The King of the Underworld returns, and due to a marriage contract, he comes back to the city to marry, only to meet his ice-cold wife. Surrounded by numerous admirers, including a former first love, a beautiful colleague, and a cute lolita... As skilled enemies attack, watch how the King of the Underworld responds.

When a person dies, they either die light as a feather (aka unimportant) or heavy as Mt. Tai (aka very important).

A genius talisman practitioner is reborn as a seven-year-old girl! However, her innocent appearance belies her vicious personality.