Can someone explain what happened to his daughter? Was it his real daughter that he left?

Fr tho

If you’re referring to the kid that was helping him at the beginning, no. There are even people mentioning feeling pity for the reasoning of why he was so nice to the kid and it’s because of what happened to his actual wife and child.

I thought she was adoptive, no?

Twas a boy in helper child in the beginning
(=・ω・=)

Okay it clears everything up