Seventeen Again: The Sweet Life with My Family - Chapter 16

Xia Yan passed through to the world of Bleach and became an eleven-year-old boy. He was rescued by Renji and Rukia in the Seireitei, and he was studying at Shin’ō Academy, and he was a student of the same class.
He is a top student of the Shin’ō Academy, and he is vying for strength by various teams. In the end, he has entered the first team of secret mobile maneuvers.
He will use punishment to kill every person who tries to threaten the martyrdom and protect his loved one.

- Description from Novelupdates

12 years ago, it was the beginning of his catastrophic life.

Just because of the Wang family’s selfishness in wanting to possess his family’s land, Baichen’s beloved parents were murdered in cold blood. And he himself was framed for a crime that jailed him for 200 years.

The fury building up inside him was enough for him to do anything to bring justice to himself and his family.

Finally, a chance to revenge came to him when he received the “Life Changing System” which allowed him to turn back time and fix everything before it happened.

He needed to complete various missions without knowing what he had to encounter in order to gain skills that helped him survive and revenge on the family who had destroyed his family and made him suffer!

“This time I won’t let anyone tear my family apart again. I’m going to kill Wang Chengye. I’m going to destroy the whole Wang family. My parents are going to live lives of happiness. I swear it!”

(Glory Forever Public Company Limited)

Eluard Kai found himself transmigrated to a magical world.

A steward came over and declared that he was now the academy master of the school in front of him before disappearing to nothingness.

“That damn steward said I am now the owner of this place then left me all alone! What the hell am I supposed to teach them anyway?!”

He feared that some prodigious arrogant young master would come over and enroll when he himself didn’t know what he was supposed to do.

“But this is a deserted academy, right? No one should come over here, right?”

Unfortunately, his nightmare came about.

“Academy Master, I am here to enroll in the Heavenly Magic Academy. Please allow my request in behalf of my lackluster talent.”

Eluard Kai almost blacked out until he heard a prompt in his head.

[ A student requests to enter the Heavenly Magic Academy. ]

[ Accept the request? ]

One day, I woke up only find out that I’d become a Demon Lord, an individual responsible for protecting a dungeon. The world I’d been spirited away to was one filled with violence. Gigantic monsters wandered through it and competed with each other each and every day for the right to survive. I had no choice but to strengthen my dungeon’s defenses in hopes of living another day—or at least that was what I’d thought. For some odd reason, I instead ended up spending my days in relaxation and bliss.