The martial arts team declined an invitation to the Tokyo Olympics, but had a golden moment on the show.
Taekwondo fighter Kimia Alizadeh defected from Iran, accusing its ruling regime of "injustice" by exploiting Iranian women as political tools.
Jean Lopez has been accused of sexually abusing at least four female taekwondo athletes.
It's unclear whether her appearance is intended as a propaganda tool or an opening for dialogue.
The move is a striking change following months of tension on the Korean peninsula.