Hell App (Web Novel CN) - Chapter 72: Math Problem

Lee Jin Woo once lived a dismal life.
He lived pitifully on a day to day basis in his five-pyeon studio filled with mold.

Then, one day, he died in a sudden fire.

When he wakes up, he finds himself inside a novel.
But there’s just one issue…
He had become the novel’s villain!

The Reticent Blade is, first and foremost, a wuxia novel, meaning that the world and its character’s powers and abilities are more grounded. Instead of cultivators who can soar through the heavens and shatter planets, you will find martial artists who can still perform superhuman feats but not so fantastical as to tear through space or achieve immortality.The world of The Reticent Blade is one of medieval China, loosely based upon the time period of the Ming Dynasty. It is a time of chaos and strife, where war and death are rampant. We follow the intertwining story of several protagonists and antagonists as they navigate the chaotic times, unraveling the threads that connect the past, the present, and the future of the world.The Reticent Blade is a story of heroism, love, revenge, and cruelty.The Reticent Blade is a story of both the righteousness and vileness of the jianghu.

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

The main character is reborn as a character from a game he played in his previous life. This character falls into ruin along with the villainess, spending the last of their years together. A man named Kururi Helan.