Killing Grounds of Gods and Devils - Chapter 1: Cataclysmic changes within the school

Su Ran, a music prodigy, woke up transmigrated into a book.

At that point in time, the main story arc in the book had already been completed. As a villainess female supporting character, not only did she need to take over the original owner’s pitiful life in poverty, she also gained an instant son right at his rebellious period.

Ten or so more years from then, the son would turn into a twisted, evil villain. He would appear in one of the extra chapters to pick on the male and female lead’s children.

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Su Ran: Son, you shouldn’t be too outstanding.
Su Han: Why not?
Su Ran: ’cause you will be killed.

Su Ran: Son, would you like to learn music from me and become a zen, little fairy boy who only needs to drink dew.
Su Han: No, I want to go into business so I can support you.

- Description from Novelupdates

Ling JingXuan, a secret international doctor and killer. Can save people with one hand and kill with the other. Right or wrong, both paths without exception would cause people to be terror stricken. One morning he crossed over, with only four bare walls for a home and was also given two free stir fried little buns. Ling Jingxuan can’t help but be speechless.This life, can this pit be any bigger?

Yan Chengrui, Qing dynasty’s only prince with a title of General. On his first mishap on a mission, a good man forcibly became a slave wife. There was no one who was not disappointed from the imperial family. But, don’t know when slave wife learned it but poison concubine’s poison was incomparable, who dares to try to straighten him out?

“What? 30 Wen? You’re robbing from people, so expensive!”

One day of the month of a certain year, Ling Jingxuan takes the two little buns to the market to buy living necessities.These five year old little buns after hearing the price have to hold back their red faces. Fried little hands rigidly held onto the broken wallet, Ling Jingxuan suddenly wanted to cry but had no tears. Sons, we earned money but not spending it, don’t tell me its left for the foals?

At the end, it was obvious they carried two liang of silver. Stuff that was sold at the last minute were the cheapest. Seeing the smile of satisfaction from the little fried buns, Ling Jingxuan secretly vowed. One day he would develop them into super meat buns，a rich 2nd generation family!

- Description from Novelupdates

There are a total of seven sins, and a revelation is made to a young man named Alex that he is destined to become a demon lord, more especially a demon lord of sin called LUST.

It's not like he can change that and because he always knew something about himself was different—not in a physical sense, well, maybe a little—and not in a mental sense—but rather because he is thrown into a demonic war that compels him to accept his new reality.

He was only aware of a difference in himself. Relating to him and the ladies who are drawn to him... Well, it was more or less like he was a magnet in front of all the girls, and all the girls were drawn to him like a metal.