They stopped and watched him for a minute and Ludmila said that Federico had a face that nobody else had.
Fedemila (Fede/rico and Lud/mila) is the friendship/romantic pairing of Federico and Ludmila Ferro.
A girl morphed by the effects of poisonous mushrooms, she sets off on a journey to feed her craving for fine fungi.
She is most tempted by unknown mushrooms, even trading her health for a taste.
When Federico and Ludmila are close to each other, Ludmila becomes a different person, someone who's a lot nicer and kind, and Federico often tries to show everyone the Ludmila he sees.
In Season 2, Episode 78, they share their first kiss and Ludmila finally starts to change - this time for real.