Konstantin is a fan favourite character (Picture: BBC)
But with just one episode left to find out their fate, it seems some of its cast members don’t even know how the series will conclude.
Konstantin actor Kim said to Metro.co.uk ahead of the finale: ‘I have no idea how it is ending. I can tell you that from the bottom of my heart, I have no idea how it’s going to end.’
The actor also revealed his weirdly beloved character was only meant to be in the show for a few episodes in the first season, before becoming a permanent addition.
He added: Of course, things can change all the time. I mean, Konstantin was supposed to only be in the show for four episodes in season one.
Viewers love seeing Konstantin and Villanelle’s love/hate relationship (Picture: Des Willie/BBCA)
‘You don’t know everything, we know that everything can change.’
He’d never rule out returning for more, despite season four being confirmed as being the last.
Kim said on if he thought this is the right time to end the show: ‘There’s no right time to end. No right time to end it. What is that?!’
He didn’t rule out the chance to do a season five if the opportunity came around, and said: ‘It’s definitely possible, of course, why not?
‘Everybody wishes that. I wish it too. Let’s talk to the producers!’ Kim told us.
While there are no plans for a season five, a spin-off dented on Fiona Shaw’s character Carolyn Mertens is thought to be in the early stages of development.
The MI6 spymaster has been through it all so far, and the supposed new episodes would act as a prequel.
Carolyn was a young agent in Moscow in the 80s, and the new series may hone in on that period and her early life.
‘In many ways, Carolyn was a bit of a curveball choice for a prequel, but in other ways she was an obvious choice,’ an insider said of this new project.
‘The creators could have gone for Villanelle or Eve, but Carolyn provides a different take on things,’ the source told The Sun.
Killing Eve season 4 concludes on Monday on BBC iPlayer.