MTL - Mr. Yuan is Always Unhappy - Chapter 66

Within the virtual world of “Avalon Online”, Finn, or otherwise known as “Echo” within the game, was one of its greatest players. After logging off from a long session, however, he notices something awry outside of his apartment.The streets were flooded with chaos, screams echo through the night, and hell is loot loose. Monsters from Avalon Online are running through the streets, wrecking havoc. In the midst of this hellish awakening, Finn is greeted with the one gift bestowed to humanity in this dark hour:[...Assessing life experience…][Assessment Complete][Name: Finn Thorne][Age: 20][Designated Class: Assassin][Starting Level: 5][A [Legacy System] has been bestowed to you for your accomplishments within Avalon.][Assimilation System Awakened.]In this twisted turn, as the world as it was once known is gone with the arrival of magic and monsters, the remnants of humanity must level up if they wish to survive.Finn is left in this dark, hopeless apocalypse, using his own experience from Avalon Online to best survive what seems to be an impossible task.

He is a young man without a spirit root. It is believed that this denies him the chance at cultivation. However, a mysterious lady imparts a Supreme Demon Classic to him and from then on, he starts his path of cultivation.
He undergoes a total transformation to emerge as the most fearsome and powerful fiendish demon in his era, that even immortals and fiends are fearful of him, and saints are at his beck and call.
Mastering the Supreme Demon Classic is the turning point in his life. He is able to unleash his immense and divine power from within, illuminating the entire universe!

- Description from Novelupdates

Liu Yan, an ordinary office worker from Earth, unexpectedly traveled to a strange world.

The heroes of the ages are on the side, embarking on a journey to conquer the heavens.

- Description from novelbuddy

Leon, an ordinary man, meets his untimely death only to be reincarnated in a mysterious realm where colossal towers reach beyond the sky. In this world, individuals climb these towers to gain power, wealth, and ultimately, godhood upon reaching the highest level. Each floor is a trial of increasing danger, filled with magical beasts, traps, and rivals. However, Leon is granted a special cheat ability: the Super Charity System.The Super Charity System allows Leon to receive incredible rewards for any charitable act he performs. Whether it's offering aid to struggling climbers, donating resources, or saving someone’s life, the system exponentially multiplies his gains in return, bestowing him with rare artifacts, strength, abilities, and many more.As Leon progresses through the tower, his rapid growth and benevolent acts draw attention. Some revere him as a hero, while others plot to use his generosity for their own gain. But as he ascends, Leon faces a profound question: in a world where power is everything, will he stay true to his charitable heart, or be tempted to exploit the system for himself?****It will be R-18, you all have been warned and invited *cough*I meant warned.