Cecilia had to live because of her faith. She later met the captain of the Survey Corps, and he denied her faith.
Levi meets a girl who is somehow so steadfast in her faith in the wall religion, but he falls in love with her and decides to save her.
"But, the wall..." Cecilia couldn't bear it anymore, her suppressed emotions burst out, and tears rolled down her face.
"Wall, wall, can there be something else in your mind?!"
"No more, I live by this faith now... The wall, it can protect us!"
"... If I prove to you that we can still live well without walls, whether I know the secret of the wall or I kill all the giants, no matter what method I take, it only proves that the wall is not that powerful and sacred at all, then you can let go of this obsession."
"..." Cecilia didn't know what to say for a moment.
"Okay, you wait for me."
Intention: There is always someone who loves you in this world