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Levi Ackerman lived underground (where many lower-class citizens resided) with his two best friends, Farlan and Isabel. Although they were all unsatisfied with struggles that are presented from living in the underground sector, they made the most of their situation and soon grew accustomed to that way of living.

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The gang was later approached with an enticing deal. They were offered citizenship on the surface is they could find a specific item. While in pursuit of their goal, the trio was caught by Erwin Smith and other members of the highly respected Survey Corps from the surface. Erwin then asked Levi to join the Survey Corps after seeing his impressive skills with ODM gear.

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Levi refused the offer and argued that he preferred to remain with his friends. Erwin would not take no for an answer and offered Levi's friends spots in the Survey Corps as well. Erwin's offer came with a and a clean slate and record (Levi and his friends lived a life of crime to survive). After a bit of thought, the gang accepted the offer.

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Levi's mother died when he was young, and a man named Kenny Ackerman took him under his wing. He taught Levi almost everything he knows. In Levi's years with the Survey Corps however, Kenny became an enemy to Levi. It can be said that Levi's mentor was Erwin who he eventually looked up to and greatly respected.

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Levi and his friends officially became members of the Survey Corps (also known as the Scouts) and began training. It was a major change in Levi's life and his first time leaving the underground sector. He finally saw the beauty of the sky and world on the surface.

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The members of the Scouts regiment were skeptical of Levi, Farlan, and Isabel because of the trio's past life of crime. Many didn't trust the trio and tried picking fights with Levi. Levi was tested multiple times by authoritative figures and members, but Farlan and Isabel helped to get him out of trouble.

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The trio went on their very first mission beyond the walls alongside the other members of the Scout regiment. Levi split away from his friends for a while, and when he returned, he found their lifeless bodies sitting in front of a massive titan. His entire world was shattered within a matter on seconds. Although he was grief stricken, shocked, and horrified, Levi managed to defeat the titan.

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Levi was left a broken mess after defeating the titan and crying out for his beloved friends. Erwin arrived at the scene, and did not offer pity or sympathy. He instead told Levi to not look back and to have no regrets. Erwin urged him to devote his lives to the Scouts and fight for his fallen comrades. Levi decided in that moment to follow Erwin on this journey and never look back.

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Later on, Levi and the rest of the Scouts learned that Eren Yaeger (a then new addition to the Scouts) had the ability to transform into a titan. They began to acquire new, shocking knowledge about titans and the truth behind them. This knowledge propelled the Scouts into a new era where they stood a chance against the powerful titans.

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Towards the end of the show, the Scouts acquire enough knowledge about titans and resources to battle against their ultimate rival: the Beast Titan. Levi's bottled up rage and yearning to stop the cycle of horror fueled him to face one of his greatest enemy.

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The fighting died down, and the Scouts took the victory of the battle. They were able to venture further than they had ever gone, and they found something beyond their wildest dreams. In that breathtaking scene, Levi put his past self to rest. Everyone left in the regiment had changed drastically at that point, and they were truly a new version of themselves.

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In the end, Levi and the remaining Scouts were able to retrieve a very valuable item that was considered the greatest and most vital secret in their world. This of course was a major triumph in Levi's journey. He would now be able to enter into a new and entirely unfamiliar world with the knowledge they unlocked. His battle for security, comfort, and peace, however, was far from over.