Killing Eve is back for a third season and after seeing the first episode, fans have been delighted that the drama is just as compelling as ever.

One of the many elements of the show that keeps viewers coming back for more is the twisty relationship between MI6 agent Eve Polastri (Sanda Oh) and assassin Villanelle (Jodie Comer), as they swing from violence to tenderness in their obsession with one another.

And actress Oh says that the main secret to keeping the characters' relationship as interesting as it is, is by maintaining a sense of mystery.

"We really dive into the relationship," she told The Sun. "We both understand there's a lot of mystery between Eve and Villanelle and we play it as such. Usually what happens is, story-wise, Eve and Villanelle are kept apart and at a certain point they crash into each other then have their storyline together."

Related: Why Killing Eve's Jodie Comer admires Villanelle

The actress, who also starred in Grey's Anatomy as Cristina Yang for 10 seasons, described her relationship with her co-star Comer as "profound", saying that they "trust each other when the magic is happening".

And Oh is filled with praise for Comer, saying that she is "blown away" by the Newcastle-born actress' ear for accents.

"Jodie has a remarkable ear. She is so talented," she said. "When you hear what she really sounds like you're blown away."

With the global spread of the COVID-19 coronavirus having shut down production on film and television sets worldwide Oh revealed that she doesn't know when work on a fourth season will be possible.

"We are scheduled to go back to Killing Eve in September, but we don't know," she said. "Our show is international. You can't shoot Africa in Scotland, for example. And we don't know what is going on with Scotland."

Related: Killing Eve season 3 is the "most emotionally rocky" yet

The actress added that although we are living through a very difficult time, she is hopeful that the arrival of new episodes of Killing Eve will serve as a welcome distraction for people.

"For us, globally, this month is very tense," she said. "And the fact that the show is coming earlier and hopefully providing a little respite, a positive distraction and energy for people while they are sheltering inside, I'm really grateful for."

Following the shock twist in the third season's opening episode, Killing Eve star Sean Delaney (who plays Kenny Stowton) has weighed in on a big fan theory about his character's mum, Carolyn Martens (Fiona Shaw).

Killing Eve airs on BBC America in the US and BBC iPlayer in the UK. You'll also be able to watch the opening episode of season three tonight (April 19) at 9.15pm on BBC One.

Killing Eve Season 2 [DVD] [2019]

14.99

Killing Eve - Season 1 [DVD]

12.08

Killing Eve season 1 [Digital Download]

BBC/Sid Gentle ProductionsAmazon

Codename Villanelle (Killing Eve #1) by Luke Jennings

3.00

No Tomorrow (Killing Eve #2) by Luke Jennings

US$122.99

Endgame (Killing Eve #3) by Luke Jennings

13.19

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Killing Eve's Sandra Oh speaks about creating her on-screen chemistry with Jodie Comer - digitalspy.com