This Wizard is So Unscientific! - Chapter 245 - 231 Old Sun VS Dark Sun (5k)_2

Roy’s life was nothing special. The only thing commendable was the last few moments when he saved a mother and her child from a drunk driver.
…
It’s really an egg! Damn it, what kind of monster have I become? Did I fall into Hell instead of making it to Heaven??
Join Roy as he ventures through various worlds with the Custom Made Demon King System—a system that allows Roy to draw anything he can imagine and create it through exchanging souls!

Shen Weiyi has a younger, boy-next-door boyfriend whose allure lies in his height, long legs, and strong torso. With a wild mind and a talent for flirting, the eighteen-year-old Jiang is impulsive, fun-loving, and fickle, exhibiting both innocent and wolf-like traits at the touch of a button. Beloved by countless girls, he always thought Shen Weiyi, who would do anything at his mere call of 'sister', would forever indulge him, only to find she suddenly doesn't want him anymore.Breakups are breakups; whoever regrets it is a dog.Shen Weiyi, once red-eared and compliant to his every whim, now won't look back, leaving an eighteen-year-old Jiang's genuine liking turning into a resolute declaration of disinterest. 'Jiang,' she says, 'I date for happiness, not for extra headache.'Later, a desperate Jiang tries everything for her, getting injured in the process and lowering himself to the dust, only to see her blooming in another man's arms, which drives him to a jealous rage.Sheng Ting, the genius of the Z University, untouchable and seen by everyone as the embodiment of purity and restraint, had decided the names of their unborn children upon his first glimpse of Shen Weiyi.[Childhood friend VS Sudden love, not seeking the adoration of the whole world but asking to be your one and only exception in life.]

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.

***

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

Jiang Chen, son of the Heavenly Emperor, unexpectedly reincarnated into the body of a despised young noble, thus embarking on the path of the underdog trouncing all commoners. No one has the right to call himself a genius in front of Jiang Chen, as no one has a better understanding of the heavens than the son of the Heavenly Emperor. “Genius? He who adheres to me shall ascend. Those who oppose me can find solace in hell!’