The relationship between Regina (Lana Parrilla) and Robin Hood (Sean Maguire) of ABC's Once Upon a Time is a complicated one.

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With Zelena (Rebecca Mader) tricking Robin Hood by impersonating Marian (Christie Laing) and getting him to impregnate her, the dynamic is very interesting. Regina is obviously furious with her "wicked" sister, and the dynamic continues into season 5.

Parrilla recently spoke with PopSugar about Regina and commended the maturity her character is displaying through this storyline.

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"It's a complicated one! It hasn't really been scripted, but I have been toying with the idea of how can he have sex so quickly after she left?" Parrilla said, of Robin. "I don't care if she is his wife, I thought his heart belonged to Regina. I think that one thing I love about these characters, is they are mature. I think the way Regina is handling this is in a very mature way. It is an unfortunate circumstance and you [Robin Hood] manipulated into this, you didn't know who she really was, you thought you were with your wife, you thought it was the end between us, and there was no return. I get that you were making efforts and trying to move forward, however you moved forward with the wicked witch - unbeknownst to you - and now we are in this situation. I think what we saw in those last episodes is Regina saying, 'We are going to have this baby but you are going to be under watch.' Robin is going to have the relationship with the baby, but you are on parole for the rest of your life."

Meanwhile, Parrilla said that the roles are switching between Regina and Emma (Jennifer Morrison) in the new season. After all, Emma is turning to the dark side while Regina is trying to bring her back to the side of light.

Parrilla said that Regina is going to have "a huge impact" on bringing Emma back to the good side.

Once Upon a Time season 5 premieres Sunday, Sept. 27 at 8 p.m. ET/PT on ABC.

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Once Upon A Time, Television, ABC