MTL - Cultivating From Obtaining Experience - Chapter 1 premature aging

A teenager named Evan Mason was reincarnated into the magical world of Harry Potter and goes to school at Hogwarts!
With only his knowledge of the future and great talent for magic, he takes the path towards the top of the magic world, only to realize that ever step he took, changed everything!

- Description from Novelupdates

“You’re pregnant, young master.”Valentin Wiche, the beloved only son of the Viscount Wiche family. One day, he realizes that he has been reincarnated as the villainous supporting character in a novel he read in his previous life. To avoid his miserable fate, Valentin seduces an alpha at a ball.“Your scent is truly dizzying…”Did that alpha enjoy their night together that much? He starts showing tremendous obsession.‘Where did this come from?’‘I must have this.’He only did it to avoid the terrible ending of the original story, but the result is pregnancy? Moreover, the identity of the child’s father was someone even more incredible than he thought – Reynard Dennox, the only heir to the notorious Dennox ducal family and a naval hero of the Heston Empire.On top of that, true to his reputation as a klutz, Valentin’s pregnancy is immediately discovered….“Why the sudden ring…?”“What do you mean why? We even have a child on the way, so we need to get married quickly.”

Dying at a young age after a disappointing life. Mat thought he hit the jackpot when he got reincarnated on a tropical island as a baby. Here, exploring mysterious lands and learning magic are a reality. The world of Elydes is beautiful and magical, wild and savage. While the Guide is impartial to all, people are not. Mat has the lowest starting point possible, and those like him rarely go far. To not let his humble birth define his life, he'll need to find the determination to grow stronger and delve into the mysteries of Elydes.

Jang Joonbum started stream to enjoy an easy life.