Contains some spoilers from Attack On Titan season three. A love letter was written by none other than Hange Zoë as a child. She met a boy named Levi Ackerman in the underground's a a kid. They spent almost a whole year together in the underground because Hange would always go and visit him. Unfortunately, one day Hange's family moved away and Levi and a Hange had to part ways. Levi and Hange were sad to part ways, but they were strong for their age. Little did Levi know that a love letter could change his entire life. The characters are Hajime Isayama characters