Fairy Tail: Lost One - Chapter 36: Throne and the Rift?

What would you do if you were transported to an academy where becoming immortal was possible? Where magic spells and swordsmanship were your courses and fighting zombies and wars were your exams? Dawn Academy was no ordinary learning institution and Xiao Lin was about to find out how mysterious and exciting this magical academy really was.

My name is Lin Fan. I have crossed the border. I want to cultivate immortality, and my mana is boundless.

Exile Ren?

The start is hell mode?

Fortunately, there are crossing benefits, and it is still a stitched monster sandbox game system!

Liver Emperor Ren? Hamster Ryan? Isn’t this basic operation?

- Description from novelbuddy

Bob was a good guy. He had done everything you were supposed to do. He exercised, he kept to a healthy diet, he'd studied hard, gotten excellent grades, and was working towards his masters. Somehow, things just weren't working out for him like he'd been told they would. He was stuck in a thankless position, constantly passed over, and it seemed that the only being on earth that cared about him was his cat.

Then things got worse.

Never back a man into a corner unless you want to find out just how hard he can fight.