Oliver and Alwyn explain why she shot her part of the scene after filming had wrapped.

Warning: This post contains spoilers fromConversations With Friends.

It all ended with a phone call.

Conservations with Friends

Joe Alwyn and Alison Oliver on ‘Normal People’.Enda Bowe/Hulu

In the end, it looked like Nick and Frances were going to part ways.

After the news that he slept with Melissa devastated Frances, she returned to Bobbi’s arms.

“There were a fair amount of phone calls [in the series],” Alwyn tells EW.

But when it came time for the most important phone call, that wasn’t possible.

“We filmed that scene months and months apart,” Alwyn says.

And then when Alison had to shoot her side, we’d wrapped.

I was on another film.

So I think another actor had to read my lines on the phone for her."

And then they wanted to do my side of the call actually at Christmas time because she’s outside.

So we did it as a pickup in December, but Joe was on another film then.

So they had another actor come and do the lines with me."

“So it felt kind of right coming back and doing the last scene.

But yeah, there was no Joe when I was doing that.”

Conversations With Friendsis available now on Hulu.