This is the first time I hear of Sunny
It's in the episode 'A New World' if you want to re-watch.

I love Connor, he's a poor troubled young man who had been betrayed by many.
I think he's one of the best examples of the consequences of child abuse evre portrayed - and yes I'm also so happy that Angel could give him a new life (Origin is one of my favourite episodes!), even though the price was so high.