The Emma (Jennifer Morrison), Snow (Ginnifer Goodwin), Regina (Lana Parrilla) relationship on ABC's Once Upon a Time continues to grow more complicated as secrets are revealed.

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With Snow divulging her secret to Regina, their relationship will become even more complex as Regina may be tempted to reveal it.

"Snow was [once] asked to keep a secret and couldn't keep her mouth shut. Can Regina keep her mouth shut?" Once Upon a Time co-creator Adam Horowitz told TVGuide.com this week. "I'd say Regina is probably a stronger and better secret-keeper than Snow White. But it does create a bond between the two of them, a bond that's gone back a really long time. She was her stepmother."

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It will continue to be tough for Emma as she comes to terms with the fact that Snow and Charming aren't exactly who they seem to be.

"For Emma right now, the two people she trusts the most in her life are lying to her, and she's suppressing that," co-creator Edward Kitsis said. "So finding that out will be kind of a bummer. She's done a lot of growing over the three and a half seasons. And what happens when you find out that the person who is helping you grow might actually be as bad as the people you're trying to get away from?"

It was revealed during Sunday night's episode that Snow and Charming were at fault for killing Maleficent's (Kristin Bauer van Straten) baby back in the Enchanted Forest. Maleficent has returned to confront Snow and it is not clear if she will take revenge on Emma or anyone close to Snow.

Once Upon a Time airs Sundays at 8 p.m. ET/PT on ABC.

Watch the promo for the next episode of Once Upon a Time here:

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Once Upon A Time, Television, ABC