Evolution of the Ruined Heir - Chapter 75: Highbloods

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

Suffering the machinations of family, Remus is sent to the newly built border city of Greltheaven. A place filled with opportunities but also dangers.If it had been up to him, he would have stayed in the safety of the empire, slowly building his business as he had planned, but he did not have a choice, either go to the dangerous city or live a mediocre life.Which he is not willing to do.Swearing revenge, he packed his bags and moved to Greltheaven, a city of great dangers and fortune.... A brothel is not an easy business to run, much less get success, but since fate had so kindly decreed it upon him, he will not only run the brothel but will make it immensely successful.He had plans, big plans for it; he only hoped the city would remain standing long enough to turn his small business into an empire.

I became the childhood friend of the protagonist in a novel. The childhood friend who died from taking drugs.

The world had shown Baines every possible lesson it could teach; from familial love, joy, and peace to hate, rage, betrayal, and pain.He got detached from his family by the wimps of others.But, before he began his journey to find them, he was forced to witness that scene that haunted him once more. The destruction of his home.He was about to give up on life when an unforeseen opportunity presented itself.There, he vowed, “The world will bleed for what it has done to me.”Using the greatest collections gathered by his ancestors, he set out on the thorny path to revenge.Little did he know, the result of his actions followed other cascading events that then threatened his world.Does he refuse to help the world because of the pain it had caused him? Or, will he join in the destruction?