Emmerdale's Moira Dingle and Nate Robinson sparked shockwaves in the village in 2019, when it was revealed they were having an affair.
But that wasn't the only discovery that left Moira's husband Cain Dingle reeling and wanting revenge, as he also learned that Nate was his secret son that he never even knew existed.
It soon emerged there was a lot more to the affair, and that Nate had been seeking revenge against is long lost father for months.
Three years on, and next week the pair face fresh accusations that they've reignited the affair that tore their family apart.
So what exactly went on between Nate, Cain and Moira in 2019, and who else was involved? Here's a recap of the explosive storyline...
Why did Nate want revenge on Cain?
Nate arrived in the village in early 2019 and soon embarked on a romance with Amy Wyatt, while also having flings with several other female villagers.
But he soon set his sights on Moira after working at the farm with her, and he seduced her into a steamy affair.
As the truth came out, as did his true identity after months of speculation - as he was shown targeting Cain by trying to ruin his marriage, and trying to get his son Kyle taken away from him.
It was soon revealed that Nate was Cain's secret son, something fans had predicted. When Cain was a teenager he embarked on a romance with a girl named Cara who secretly fell pregnant with his child.
Cara vanished one day and Cain never saw her again, and had no idea Nate existed until he revealed his true identity in 2019.
It turned out that Cara lied about Cain not wanting to know his son, and in fact she had been warned away by Cain's mother Faith who was intercepting all her correspondence to Cain too.
She later explained it was out of fear over her abusive and racist husband Shadrach, with her fearing how he would react to the romance and the baby news.
Why did Moira cheat?
Moira gave into temptation with Nate and continued the affair for a while.
When later confronted about it, she suggested it was down to Cain not really being there, after Cain struggled to cope for months after believing he had killed Joe Tate the year before.
Moira claimed she was feeling neglected, and this led to her cheating on him - but she also claimed it was a form of self-sabotage and self-harm.
Cain's revenge
Cain found out about the affair and tracked the pair down at a hotel. He then took them on a deadly boat trip as he sought to kill Nate.
It's then that the truth came out as the men viciously attacked each other, with Nate unmasking his identity - only for Moira to fall into the water.
Cain saved her from drowning, but as they were in the water the boat exploded and injured Nate - with Cain soon reluctantly saving him.
Months passed and Cain refused to forgive both characters, despite his family warming to Nate which left him furious.
Further down the line, after a shooting accident and other family drama, Nate proved his loyalty and his remorse for what he did, and he and Cain now have a good father son relationship.
Cain eventually forgave Moira too, and the pair are now together again.
Are Moira and Nate having an affair again?
There is no affair rekindling between Nate and Moira, and it is simply a misunderstanding.
Moira has been helping Faith amid her cancer diagnosis, which she has agreed to keep a secret from her family until Faith is ready to reveal all.
Her secretive behaviour leads to Cain's sister Chas believing she and Nate are involved again, after she finds Nate dressed in a towel in the kitchen.
Got any theories or thoughts on the storyline? Let us know in the comments section below
Emmerdale airs weeknights at 7:30pm on ITV, with an hour-long episode on Thursdays.
