The "Glee" season 5 tribute episode for Finn Hudson and Cory Monteith is not only tough for the cast to film, but Dianna Agron is now voicing her thoughts on not being invited back for the episode.

"It hasn't completely hit in yet," admits Agron to the New York Post.

"He was truly one of the most wonderful people I've ever met in my entire life, and that's something that everybody can say about him, you know?"

Agron's character, Quinn, shared many pivotal moments and scenes with Cory Monteith's character, Finn. Yet despite the history, Agron will not be making an appearance during the "Glee" season 5 tribute episode.

Despite being surprised, Agron is quick to say that she will go back in heartbeat if Ryan Murphy extends the invitation.

"I think moving on might be the wrong choice of words because ['Glee'] is always going to be a part of me and with me and I would always go back," continues Agron.

"So it's not necessarily about a departure. It's about what it's imparted in me and what it's given me."

Still, perhaps Agron is saving herself from emotional grief, as the cast members currently filming the "Glee" tribute episode are voicing the difficulties of filming the episode.

"There are so many incredibly well written and powerful scenes. When [the cast] got the script, we were all reading it together and we were like, 'Did you get to that one scene.' And when you see it everyone will know what that one scene is," says Kevin McHale.

Still, McHale admits to TVLine that shooting has been "extremely emotional" and at times "hard to get through."