So, that’s the reason why Abel found Wendy in the forest, because he didn’t accidentally enter the forest, but he had a secret room in this forest…

The secret of the black health science that was thought to be for the benefit of the world but was only for the satisfaction of his lust.

And also why he seemed to know the ins and outs of this forest, not because he died here and travelled around, but because he had already memorised all the ins and outs of this forest.