10 nen goshi no HikiNiito o Yamete Gaishutsushitara Jitaku goto Isekai ni Ten'ishiteta - Chapter 2, Part 8. Yuuji, Take Up Alice, the Little Girl from Another World, as His Stepsister

In novels with a stud there is always a Senior Martial Brother like this:

In the early stages of the novel, his innate talent is high, his cultivation is good, his appearance is handsome, and he has an intelligent, cute younger Martial Sister as a fiancée.

In the middle stages of the novel, he is caught unprepared and defeated by a young disciple (the protagonist) in the sect who’s hardly remarkable at all. From then on, he falls from his godly altar and loses his brilliance. Even his young Martial Sister leaves him for someone else.

In the late stages of the novel, he continues to turn dark, going down the Demonic Path and becoming the major villainous boss. However, the protagonist still ruthlessly defeats him and his soul is eternally sealed.

Once Qin Mo opened his eyes, he discovered that he had become this Senior Martial Brother.

- Description from Novelupdates

When Xiao Fei was three years old, he was caught by a man with a sharp-nosed monkey and taught him to cultivate. The old man is Sun Wukong. In the past ten years, he has taught him the eyes of the fire, the copper and the iron bones, and the great product of the immortality… After the learning, Xiao Fei went down the mountain and accidentally entered a noble school. Pure school flowers, the best Lori, Miss Qianjin, beautiful maid… I like to sleep with him. Oh no, it’s a friend.

- Description from Biquge.com.cn (translated)

The unprecedented magician who will eat all the magic books of the world has appeared.

“Master, I'm sorry... It's all my fault that you could not break through before your last moments.”

“Don't worry, my disciple. I will not die,” said Xu Fan as he smiled at his disciple, whose face was covered with tears.

“If only… If only I could get you a few more Foundation Establishment Pills...” The genius of the sect knelt on the floor while crying like a baby.

Xu Fan looked at his oldest disciple and sighed. He then took out a Foundation Establishment Pill and nonchalantly threw it into his mouth.

The next second, divine lights of five different colors filled the world.

……………………………………………………………

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