Hange and Erwin always thought is Levi as a cold man and and they never thought of him as a father until Levi received a letter and then he left to the undergrounds

Levi was gone for hours then he finally returned to headquarters but he wasn't alone he was holding a child (You) that looks like him in his arms that looks dirty and hasn't ate for days

Levi: Doesn't say anything

Hange: stares at Levi and seems excited and confused at the same time

Erwin: "Levi explain"