With Emma Swan (Jennifer Morrison) turning into the Dark One, characters in Storybrooke cannot expect an easy season five. Emma and Captain Hook (Colin O'Donoghue) have already been reported as heading for trouble and now, another character is expected to have a shaky love story in the upcoming season.

Lana Parilla teased some troubles between her character, Regina and Robin Hood (Sean Maguire) in "Once Upon a Time."

In a "Once Upon a Time" cast interview with ET Online, Lana Parilla was asked if Regina will finally have her happy ending with Robin Hood. She laughs and turns to Rebecca Mader, who plays Regina's sister and Wicked Witch of the West Zelena, and asks, "No, sis! Are you gonna screw it up for her?" to which Mader answered, "I already have."

Viewers of the fairytale adventure drama will remember that Zelena took on the identity of Robin Hood's wife, Marian. She went on to live with him outside Storybrooke and the two are now expecting a baby.

As twisted as it sounds, Regina opted to not write Zelena out of the story but instead keep her in the Storybrooke asylum. No matter how complicated Zelena and the baby makes her love story with Robin Hood seems, Parilla says that Regina is just excited to be an auntie.

Something fans can also look forward to come season five is Regina's attempt at making good with Emma. Parilla says of the former Evil Queen, "Yeah, I think Regina really hates owing anyone anything. But uhm for Emma, absolutely and for everyone. She's gonna do everything she can with everyone. It's like Operation Emma season five."

Season four of the fantasy drama ended with Emma sacrificing herself to be the Dark One instead of Regina taking the dagger. This gave Regina the freedom to become the good person that she wanted to be and rewrite her ending to a happy one with Robin Hood.

"Once Upon a Time" returns with season five on Sept. 27, 2015.