The cast and crew of "The 100" are already back to work on the upcoming fourth installment of the series.

Recently, behind-the-scenes photos from the Vancouver set of the series surfaced on social media sites, showing the filming site of season 4. The photos were posted on Twitter by a fan who chanced upon the set while trekking in a forest somewhere in Vancouver.

In one of the photos, a sign put up by "The 100" production crew is shown, which reads, "100 Films Productions Inc. is currently filming scenes for the TV series 'The 100.' We thank you for your cooperation and apologize for any inconvenience."

Another behind-the-scenes photo of executive producer Jason Rothenberg and Marie Avgeropoulos, the actress behind Octavia, was also posted on the official Twitter account of the writers of the series.

The caption reads, "@JRothenbergTV and @iamAvgeropoulos enjoying a beautiful(ly rainy) shoot day in Vancouver. #The100."

A separate tweet shows Bob Morley and Eliza Taylor cuddling for a photo in between takes. The two play Bellamy and Clarke, respectively, in the series.

While the photo may suggest that they are getting back together in the upcoming season, Taylor previously revealed that Clarke won't be ready to be romantically involved with anyone just yet following the death of Lexa in the previous season.

"I don't think she's ready to explore new love in her life. When you lose a loved one, you think that's the end of love for you. That's just how humans react, that's how we grieve. But I definitely don't think that's the end for Clarke, no matter how much she thinks that she'll never love again, I hope to God she does and I'm sure she will," she said in an interview with TV Line.

"The 100" is expected to return in early 2017 on The CW.