EXCLUSIVE: 'Once Upon a Time' Stars Spill the Secrets to Captain Swan and Snowing's Romance: 'It's True Love'

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Welcome back, Oncers!

It's been nearly three full months since our last scoop-packed Once Upon a Time article and we know that you have been going through some serious spellbinding withdrawals. (Trust us, we have too.)

So ET recently traveled to Storybrooke -- aka Vancouver, Canada -- to attend the Once Upon a Time 100th episode celebration, and we brought back some exclusive interviews with your favorite fairy tale stars. Hey, don’t say we never gave you anything…

To help you get even more ecstatic for this Sunday's highly anticipated spring premiere, we're gifting you with multiple videos and articles throughout this week. First up, we have all the swoon-worthy goodies straight from Jennifer Morrison, Colin O'Donoghue and Josh Dallas!


MORE: 'Once' Bosses Spill on True Love's Kiss and the Same-Sex Romance!

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Underworld Woes: Emma's evolution over the past 100 episodes has been filled with magical twists and turns. From a non-believer, to the Savior, and Dark Swan, to a girl on a love-fueled mission, Morrison revealed that Emma's journey in the second half of this season is all about facing her demons.

"Well, now that Emma has been through that Dark Swan experience, she's sort of in a more vulnerable and open place than she's ever been in her life," the blonde beauty dished. "She's determined to save Hook and, obviously, desperate to save Hook because the stakes are very high at this point. He's actually in the Underworld, which is not a great situation."

Well, that's definitely putting it mildly. According to O'Donoghue, the Underworld is one of the most treacherous adventures our group has ever embarked on. "The whole second half of the season is basically they're coming to find me," the actor explained.

"He genuinely sacrificed himself for the greater good and he tried to make a difference in the world and he tried to redeem himself, so that's where he is," he said. "But he's suffering in the underworld, he's suffering really badly."

Do you hear that? That's the sound of millions of "Hookers" hearts breaking right now…


EXCLUSIVE: 'Once' Casts Another Pirate From Hook's Past: Captain Silver!

A Family Affair: As you should all know by now, Emma isn’t the only Storybrooke resident making her way into the Underworld -- it's going to be a Charming family affair! (Plus, Regina and Robin, of course.) Unfortunately, Emma sees this extra assistance as a bit of a hindrance, rather than a help.

"Her family decides to come along with her to try and save him and that means a lot to her," Morrison revealed. "But at the same time it puts a lot of pressure and I think she has a lot of guilt about that. So she's also dealing with the burden of worrying that maybe she's done the wrong thing for her family by letting them come with her."

Later this season, in episode 15, Killian fans will be gifted with an hour that is all about the Jones family and ETonline already broke the news that someone called Captain Silver will also be thrown into the mix. So what can we expect from this seafaring family reunion? "It's a big old pirate party!" O'Donoghue said with a smirk.

"Yes, you get to see that Liam is back and you get to see Captain Silver," he continued. "You get to see the true love that Hook has -- or that Killian has -- for his brother, and why it made such a difference for him when his brother died, and how he deals with his loss."


WATCH: Ginnifer Goodwin Jokes She and Josh Dallas 'Keep Forgetting' That She's Pregnant

ABC

Charmed -- On Screen and Off: Dallas arrived at the red carpet looking as charming as always, but he was definitely missing his princess by his side. "I feel like my partner in crime is missing," he said of his co-star and wife, Ginnifer Goodwin, who was not able to attend the event.

"It feels kind of weird to be celebrating this with her not here. We've been together since the beginning so it's a little strange, but she's out saving Zootopia somewhere," he added with a smile.

The fairy tale couple married in 2014 and now they're currently expecting their second child together. When asked how it feels to look back at their real-life romance over the past 100 episodes, Dallas was refreshingly blunt with his answer. "I'm feeling tired," he said. "I'm tired, but ecstatic and excited and can't wait to meet this new little guy that's coming into the world, and just grateful."

When fans last saw Emma, she uttered those famous words that her iconic parents always say -- "I will always find you" -- and now we finally know why. "It's the Charming motto!" Dallas explained.

It's clear that Snow White and Prince Charming are everyone's ultimate relationship goals, so we had to know the secret to their characters' success. "It's true love," he said with a smile. "It's true love, pure and simple, so you can't get better than that."


MORE: Colin O'Donoghue Talks Hook's 'Kindred' Love With Emma!

ABC

Captain Swan Cuteness: Let's get straight to the point: When asked if there will be epic Killian and Emma scenes headed our way in the 100th, O'Donoghue's response was cheeky and quick: "Maybe...." he said with a coy smile.

When we (obviously!) pressed for more details, it was clear that O'Donoghue was enjoying this game of revealing as little as possible. "I can't give you more than that!" he laughed. "This is what's great about these questions because I'm literally just going to say, 'Maybe… Maybe there will be some good Captain Swan moments. Maybe.'"

Morrison, on the other hand, was much more open about Emma's determination to be reunited with her dashing man. "I mean, I think there's no limits as to where she's willing to go at this point," the starlet said. "She's gone through so much to get to a place in her life where she's strong enough and vulnerable enough to love without walls up, which I think is a really brave thing."

"We all have gone through certain disappointment and pains in life, so we put up walls. It's very hard to love without limits, and without conditions, and in a way where you're not going to self-destruct something. It's scary," Morrison continued.


WATCH: Hook and Emma Can't Stop Kissing in This Sneak Peek!

O'Donoghue believes that the reason fans adore this couple so deeply is because Killian and Emma continuously fight for their love. "I think because it's hard work for them," he explained. "I don’t mean that to sound in a bad way. Relationships are the best things the world when you connect so deeply with somebody, but at times, those strains are hard to deal with."

The 35-year-old actor continued, "I know it's fantastical because, obviously, he's Captain Hook and she's the daughter of Snow White and Prince Charming, but in a weird way it's kind of real. I think that's why people respond to it because it's not easy. It's not just, 'Oh look at them! They're in love! Fantastic.' It's hard and they work at it, and they love each other and that's what it is."

Morrison echoed her co-star's sentiments and spilled that Emma is willing to do whatever it takes to reunite with Killian this year. "She's in this really vulnerable place and I think she'd rather die than not be with him," Morrison confessed. "I'm not the writers. I didn’t write that, but I just think that from her perspective she feels like the best version of her life will be with him."

Once Upon a Time's 100th episode airs Sunday, March 6 at 8 p.m. ET/PT on ABC.

Keep it locked to ETonline all week for even more exclusive Once Upon a Time interviews from the red carpet and tweet @LeanneAguilera with your favorite moments!