Married To The Devil's Son - Chapter 84: 24

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 Fourth Brother had squandered his wealth through gambling, leaving their mother in a critical state. To make matters worse, the creditors even asked them to sell Manbao to settle the debts!In the village, whispers spread that the golden days of the Zhou Family's cherished Manbao were over. Their elderly mother clung to Manbao's hand, tears streaming down her face.However, Manbao tightly grasped a system in her hand, a tool that would lead her and her brothers and sisters-in-law to reclaim their fortunes. They ventured into agriculture, cultivating land, growing medicinal herbs, and establishing shops, steadily improving their lives.As their situation improved, concerns shifted to Manbao's marital prospects by the sister-in-laws.“Mr. Zhuang's grandson is an excellent match – educated and well-spoken. He is just perfect for you.”“No! You should consider Mr. Qian's youngest son, who is handsome and well-mannered. You can count on him never to defy you.”Suppressing a smile, Manbao responded, “My heart is already set. I choose Bai Shanbao, my childhood friend whom I've playfully scolded since we were young.”

After 2000 years has passed, the ruthless demon lord has just been reincarnated! But his aptitude at an academy for nurturing candidates for demon lords is, “Inept”!?

Having the capability to destroy humans, elementals, and gods, after a long period of countless wars and strife, Arnos the demon lord became sick and tired of all that and longed for a peaceful world, so he decided to reincarnate to the future.

However, what awaited him after his reincarnation is a world too used to peace that his descendants became too weak due to a huge weakening in magical powers.

Arnos enrolled in the Maou Academy established to find any students that might be the demon lord’s reincarnation, but his powers are too extraordinary that those in the academy couldn’t properly judge his powers, so he’s regarded as an “Inept student”. Being underestimated and avoided by most people there, he recruited a girl friendly to him, Misha, as his subordinate and comrade, and strives to climb to the top of the demon race hierarchy to one day reclaim his former title and status.