Adrian Alister traveled to the world of Attack On Titan.

Originally, Adrian only wanted to live in peace and stability. As an ordinary person, he couldn't expect more.

However, the place where Adrian crossed is actually Wangdu Underground Street, a place full of darkness, blood, and death.

He found a small boy named Levi and took him in as his own brother.

Fortunately, Adrian's system awakened at this time, and he was able to upgrade and add points to a system that would help him to become stronger.
______
A very good Fanfic, literally a hidden gem according to me. Just give it a try, I mean just read the first few chapters and you'll know what I mean, Keke.
______
Original MTL: Upgrade Points From Attack On Titan