Belle (Emilie de Ravin) and Rumple (Robert Carlyle), one of the most popular couples on Once Upon a Time, could be heading towards some conflict as secrets are potentially revealed.

Emma Feeling 'Guilt' Over Ruining Regina's Chance Of True Love in Season 4?

De Ravin appeared alongside fellow OUAT cast members at the Xivent's Fairy Tale Chapter II event in Paris recently, teasing what was likely ahead for Belle and Rumple. After getting married in the Season 3 finale, it would be assumed that they would happy and conflict-free going into Season 4. However, this may not be the case if the secret about Rumple's fake dagger comes out.

"I think something is going to go down. She's going to have to find out about the dagger. Something tells me she's not going to be terribly happy about that," Ravin said. She noted that while a conflict may happen, they will ultimately make up. "Belle is very, very forgiving," she said.

10 Actresses Who Could Play Elsa From 'Frozen' on Once Upon a Time

The biggest buzz going into Season 4 of Once Upon a Time, however, is the inclusion of characters from Disney's massively popular animated film Frozen. Queen Elsa was showed in the final moments of the Season 3 finale, and the character is set to appear in multiple episodes of Season 4. Similarly, the characters Anna and Kristoff, both from Frozen, are also going to be in the season.

Once Upon a Time Season 4 premieres in fall 2014 on ABC, though the network has not yet announced a specific air date. It will be returning to its regular Sundays at 8 p.m. timeslot.

Tags: Once Upon A Time television ABC