If you've ever seen an episode of This is Us, then you already know why the new family drama has got everyone talking. With its talented cast — which includes Mandy Moore and Milo Ventimiglia — and heartbreaking plot-twists that can make the world ugly-cry, it's hard to not grow obsessed with the NBC drama.

However, as much as we relate to Kate's weight struggles and Jack and Rebecca's rocky romance, we're just dying to know more behind-the-scenes facts about the show!

Judging by the interviews we've seen, it sounds like the cast has a pretty tight bond. For instance, Mandy couldn't help but gush about how grateful she felt to work with Milo.

"I feel very, like, protected with him. I've never really felt that with somebody I've worked with before, so I feel incredibly lucky every day just to have this job, but then to get to work with him every day, too. I know I'm in good hands," she said.

It's no wonder why they're so convincing as a couple on-screen!

But aside from the fact that these stars are like family in real life, we discovered that there are quite a few surprising secrets that most fans probably don't know — like how the series almost had a different name!

MUST SEE: 'This Is Us' Star Chris Sullivan Weighs a Lot Less Than His Character Toby in Real Life!

Click through the gallery to see mind-blowing facts you never knew about NBC's This is Us.