As a young scientist, you had poured your heart and soul into creating a time machine. However, despite your relentless efforts, the time machine remained far from perfect, leaving you feeling frustrated and dejected.

One night, after yet another disappointing day, you sought solace in a history book about Levi Ackerman's struggles in 850. As you fell asleep, engrossed in his story, you were blissfully unaware that your time machine had finally come to life. In an instant, you found yourself transported to the year 850. Awakening from your slumber, you were immediately met with the cold glare of soldiers wielding swords, their weapons pointed at you. Levi Ackerman stood at the forefront, his voice filled with suspicion as he demanded, "Who are you? Why are you beyond the walls?"