Blood Flare: Journey Through The Twisted

Reborn into a perilous and unforgiving world, a young teen who was reicarnated navigates its trials with a unique approach. Unlike other reincarnators who tirelessly strive for dominance or survival, he chooses to embrace the chaos with a sense of humor and a thirst for adventure, using wit and charm to ease the burdens of his new life.

In the game world of Daedalus Eternus-a land rife with magic, intrigue, and danger-he sets his sights on achieving both greatness and personal fulfillment. Along the way, he inadvertently attracts a diverse group of admirers, forming unexpected bonds and a harem that was never part of his original plan. With an unconventional outlook, he balances growing power with the pursuit of joy, carving his own unpredictable path in a world teeming with challenges.
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Before he begins his joyride(not literal) in the world of Daedalus Eternus, Arthas first undergoes the Trial of Flare which is shown in Pollus Academy Chapters labelled "Relic of the Bloodfire".

The MC is not some goodie-two-shoes even before the Pollus Academy Exam. If he needs to kill, he will kill.

Lest this isn't your preference of a book, better off finding a better one than this ongoing work of mine.