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"Grey's Anatomy's" Kevin McKidd and Sandra Oh

On ABC's Grey's Anatomy, Cristina and Owen genuinely seem happier as a couple -- post divorce, but that doesn't mean that the couple will return to the firehouse they turned into a home.

After signing divorce papers to remove the conflict of interest so Cristina (Sandra Oh) and the rest of the plane crash survivors would be eligible for a settlement, the couple has found a road back to happiness, even though she recently moved in to Meredith's Alex's house.

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"I wouldn't say that there's hope for them returning to firehouse as a couple because I actually gave the word we could dismantle that set," showrunner Shonda Rhimes tells The Hollywood Reporter. "But they are genuinely happy and their happiness doesn't necessarily mean that they need to be in the firehouse. The firehouse is a place of their past; a lot of painful things happened there."

Among them: the infamous cereal tossing that came when Cristina learned of Owen's (Kevin McKidd) infidelity, the ramifications of an abortion and the two continuing to have different priorities about family and work.

"They're on a very complex journey. Cristina is a surgeon first and Owen is a person first: he wants kids and she doesn't. There are these very basic conflicts that they have in their lives that are very hard to overcome," Rhimes says. "I'm very determined that we need to have a character who is unapologetic about not wanting children, who isn't going to suddenly find herself with a baby and suddenly soften up and discover, 'Oh, I wanted babies all along.' For Cristina, having a child would possibly mean a life of depression."

"This idea that for all women all you have to do is put a baby their in arms and they're going to be happy is unfair," the mother of two adds. "I really like idea of portraying the scientist in Cristina who's not interested in kids. That struggle between these two people is going to remain and be very complex. It doesn't mean they're not going to be together now but it's going to be a very complex struggle."

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'Grey's Anatomy': Will Cristina and Owen Make it Back to the Firehouse?