The Runesmith - Chapter 541: Dungeon Setup and Skill Training.

Once upon a time, an Alchemist Grandmaster from the World of Immortals accidentally took possession of a playboy, who hailed from a rich and powerful family, and became a student in the middle of his midterms.

By the means of a miraculous immortal technique, he blended in and mingled amongst the femme fatales’ group to dominate the city! The nature of this novel’s origin is shamelessness to the core; having no sense of shame is just a basic foundation, but if the most shameless isn’t set yet, then become it!

- Description from Novelupdates

“CRASH!” the last sound he heard; the last image being the smile of his friends.Jotou Howllett, a twenty-one year old nobody who finds little to no purpose in his life, wants to be a freelancer to make it big whilst trying to avoid education. He spends his last day of freedom with his friends before he's forced by his parents to attend college. That last day became his true last day as a white light flashed and he opened his eyes in a coffin, suffocating. He, now she, found herself to be in the body of a woman who had recently passed away. Jotou comes to realize that she's no longer in her world and now is in some sort of fantasy world. The rampant problems in this world soon find themselves surrounding Jotou, from the magics to the monsters to the wars between kingdoms and cities. Jotou sets out to uncover how she got here, why is she here, is she stuck here? Alongside the companions she finds in her way.

First-Generation God King Tang San, with a trace of divine consciousness, roamed the universe, searching for the world where his wife had reincarnated. Guided by that divine consciousness, he arrived at a place called Demon Monster Land, only to find that it was a world where humans were as lowly as livestock…

Childhood sweethearts.
The most popular person in school is my childhood sweetheart.

- Description from Novelupdates