MTL - After Being Transported into a Book, I Adopted the Villain - Chapter 7

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

Penny has three brothers: one is a billionaire CEO, the second is the youngest military lieutenant, and the last is a successful actor.These three successful men had only one common ground: bullying Penny, their sore-eye of a little sister. The sister they never wished to have, and the one who claimed to be their real sister, while the sister they treasured all this time was a fake.After living a life of maltreatment in her aunt's home, some people of high standing came to Penny with news of her real parentage. She thought she was finally saved from her aunt’s clutches, unaware that what awaited her was worse.At 13, Penny only wished for one thing: for her brothers to love her and treat her like family, just as much as they loved their fake sister. She worked and studied ten times harder than anybody else just to be accepted by them. In her desperation, she foolishly fell into a trap set by a malicious person, not knowing her actions would result in the downfall of her brothers and her ending up in jail with a death sentence.On her execution day, Penny had only one thought in mind:If she ever got to go back in time, her brothers could pamper their fake sister for all she cared! She wanted nothing to do with them! And much to her surprise, Penny found herself back on the day it all began: the day she was born.As promised, this time, she wouldn’t foolishly try to earn her brothers' love and affection. Never mind family! She’d just make a lot of money, live in luxury, and make a family of her own!But wait, why is it now that she didn’t want anything to do with her brothers, they kept poking their noses into her business? Weren’t they supposed to pamper their fake sister? Why won’t they leave her alone?!And how on earth was she married in this lifetime? To make matters worse, this husband she never had in her first life was suddenly volunteering to be the father of her children?!

A terrible calamity has fallen onto Zhang Fan, not only becoming one of the three survivors of Grass Temple Village, where everyone else was horribly massacred, he was also tasked to carry one of the most evil artifacts, the Sinister Bead, and taught one of the most secret teachings of the Skysong Sect, the Brahmin Wisdom. Now he cultivates in the Jadeon Sect, his knowledge and possession will draw him into a chaotic story where he will have to carry some of the greatest burdens of the Martial World.

“From today onwards you are no longer my son. Get out” Being born into a noble family that is aiming to become the ‘strongest’, at his aptitude ceremony held on his 12th birthday it was discovered that Igni could only use fireballs. Igni who can only use beginner level magic was kicked out of his house.

With no where to go and without much magical ability, Igni is scraping by through life. However, one day he has miraculous reunion. “What? Is that Igni there?” “Gr-grandpa!?” It was a reunion with his grandfather, the man who was once called the strongest [Kyokuten] but was banished from his noble family because of his excessive womanizing…! “Grandpa! You said strong men are popular, but I can’t be strong!!” “Igni, listen carefully. Strong men are popular but, hard-working men are even more popular!!” “Grandpa! I’ll try my best!!!” Igni whose parents who banished Igni from the house, didn’t yet know of his obsession with being popular under the guidance of the strongest [Kyokuten] magician…!

“Igni that magic!” “This? It’s a fireball” “With this you can aim for [Kyokuten]! Come back here!!” “Nobility isn’t popular” “What are you saying?” This is a story where a young magician becomes the strongest by honing his skills all in order to become popular.