Beautiful CEO's Super Expert - Chapter 465 - The Nation of Etiquette

As a naive teenager, he was unaware of his own superiority.Shang Xiaojie realized the violent man who had tricked him into a hotel was actually his brother-in-law.He struggled and tears streamed down his face as he pleaded, “Let me go, you idiotic beast!”“I may be foolish, but a beast? Can’t you at least admit to that?” he asked.After drugging Shang Xiaojie, he callously taunted, “You’re just a male prostitute who comes running whenever I snap my fingers. You’re nothing, Shang Xiaojie.”Devastated, Shang Xiaojie swore, “Mussaf, I hate you and I’ll make you regret this.”Upon his return five years later, he was accompanied by a young boy.Shang Mingming asked, “Is that man my father?”Shang Xiaojie responded coldly, “No, I don’t know someone like him.”Furious, Mussaf demanded, “Where are you taking my son?”Shang Xiaojie grinned and replied nonchalantly, “I’m getting married to another man. There’s nothing you can do about it.”

When Yuan Zhi met Song Jiyun for the first time, Song Jiyun was conspiring with her brother-in-law to take over the family business;

When Yuan Zhi met Song Jiyun for the second time, Song Jiyun was planting and framing others with her breast brother;

When Yuanzhi met Song Jiyun for the third time, Song Jiyun’s breast brother was no longer by her side, but she was winking at his good brother…

Scholars can bear it, but he can’t bear it. Yuan Zhi decided… to feed the tiger with his body, and took Song Jiyun, a demon girl!

- Description from novelbuddy

Before going to college, an ordinary high school student went to celebrate and got drunk. When he woke up, he found himself in a completely different world. There was a big sect, the approaching sect entrance examination, a slum where his body’s previous owner lived, and a shared memory about a missing young girl.

When he got tangled in a fight with a few punks in this different world, he fell off a cliff and miraculously found himself still alive, with two more voices ringing inside his head. They were Sword Master and Saber Master. In the company of them, he continued to find out more about this whole new world. He took the sect entrance examination, entered the sect, met a strange man in black, and even participated in a major competition of the sect to have a chance to win over his peers!
In this whole new world, he was born again and got to explore the fantastic martial world!

- Description from Novelupdates

The strongest Demon Lord dies, and reincarnates as a human. Not only that, he because of various incidents turns into the hero’s best friend.

Follow his journey as he tries to help the hero escape his fate, and on the sideline to conquer the continent while he’s at it.