"I couldn't be in the center of that thing and not be aware it was going horribly wrong," Hunnam said Friday, via USA Today.
"I had a week when I wasn't feeling very happy," he noted. "I had allowed myself to get seduced by the scope of it and the potential upside of that financial scope for what I could then parlay into creatively (producing and writing). That was the bummer for me."
The film, which cost $175 million to make, was critically panned and currently holds a 28 percent rating on Rotten Tomatoes.
Earlier this month, Hunnam debuted his new film, Papillon, at the Toronto International Film Festival. In the film, Hunnam plays a thief sent to a primitive prison camp in colonial French Guiana for a life sentence.
As for what's next for the actor, he's planning on taking a bit of a step back.
"I'm going to hang with my girl, I'm going to write the two screenplays I want to write," Hunnam shared. "I'm going to do some therapy, think a lot about the future and just recalibrate."
The former Sons of Anarchy star shared that he's writing "six days a week, usually 15 hours a day," he says. "I write like it's my obsession and I'm so happy."
Hunnam even mused that he may give up acting altogether.
"I don't know if I feel like I've got the chops to get to the destination of putting in Daniel Day-Lewis-caliber performances. Maybe. Maybe not," he said. "But I'm certainly a long way from it. And I don't enjoy the process. I f--king love writing. Maybe I'll just become a writer-producer. I'm really, really seriously considering that."
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