I Got Stronger By Using Copper Coins Until I Am Invincible - Chapter 539 - System, I need an explanation

Eight hundred years ago, Zhang Ruochen, the son of Emperor Ming, was killed by his fiancee, Princess Chi Yao.

Eight hundred years later, Zhang Ruochen came back to life, only to discover that the fiancee who once killed him had unified the Kunlun realm and opened up the first central empire, known as “Queen Chi Yao”.

Empress Chi Yao – ruling the world, she is powerful in all directions; youth is eternal, immortal and immortal.

Zhang Ruochen stood outside the ancestral hall of the emperors, looking at the statue of Empress Chi Yao, with a raging flame of hatred burning in his heart, “When I rebuild it for thirteen years, dare to call the empress to Huangquan.”

- Description from novelbuddy

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

Betrayed by his closest ally, Caleb Ellise was forced to settle for third place in the world’s most prestigious RTS gaming tournament, Lord of Empires.Disheartened but resigned, he accepts his prize, delivered via email. But just as Caleb thought his journey had ended, fate had other plans.BLAST!A sudden explosion leaves him critically injured. When he regains consciousness, Caleb finds himself not in a hospital bed—but in an entirely different world.[DING! Welcome to Izoya Continent, Earth #212][Welcome to the Grand Tournament: Season King Lord of Empires][Host has been designated as Lord of Kingdom #9845007]Caleb quickly realizes the impossible: he has been transported into the very game he spent years mastering. Now, the stakes are higher than ever.[Main Mission: Build your kingdom, dominate the economy, forge alliances, and conquer the world][Congratulations, Host! You’ve unlocked the Lord Talent: Vision Fog (Rank: S)]Fueled by his expertise, a newfound determination ignites within Caleb. No longer just a player, he is now a lord destined to rise.As he navigates treacherous alliances and strategic battles, Caleb vows to reclaim his crown—not as a gamer, but as the true King of Kings.The game isn’t over. It has only just begun.

As if it wasn’t enough for me to be reincarnated as a child in the slums, I was taken to a city of crime and became a test subject. But then, when I saw the man that came to destroy the research institute, I realized that this was the world of an angst-filled reverse harem novel.

While living a relatively normal life after escaping from the institute, the heroine of the novel moved in next door. From the looks of it, I might be the heroine’s neighbor extra. Originally, the heroine was to save the unconscious and fatally wounded villain and in return, be subject to a fanatical obsession.

But, why. Why is the sub-villain collapsed in front of my house?

The sub-villain, Lakis Avalon, was the king of the underworld and the very same frightening man that I had met at the institute before.

“…”

I took a moment’s glance around then I kicked the man’s body away.

You’ve got the wrong house, Villain.