Casualty viewers were left aghast at the end of tonight's jaw-dropping episode as Lev cheated on Faith, and Dylan saw.
The couple had received devastating news that the only treatment option left for their son Luka was palliative care.
Faith was left in denial while Lev became angry.
She gave him an extended lunch break, which Lev used to meet the man he's been talking to on his gay dating app – codename Xandsome.
Later in the episode, the man Lev was seeing in secret showed up at Holby City hospital.
Lev turned him away, but then ran back to him and the pair shared a passionate kiss.
Just before the end credits ran, it was revealed to viewers that Dylan saw Lev cheating on Faith through the window.
Fans went into complete meltdown on Twitter, flooding the social media site with tweets after the huge plot twist.
One said: "DYLAN! Dylan just saw Lev kiss another man."
While another wrote: "Dylan saw! I wasn't expecting that."
A third added: "As if Dylan saw!'
"F*** me that ending was fantastic #Casualty I'm so excited to see how all of this plays out", wrote a fourth fan.
"Dylan saw them kissing omg... I did not see that coming", penned a fifth.
Tonight's Casualty didn't start on time, which sparked confusion among viewers.
The medical drama was due to air tonight at 8.40pm, however the show didn't begin until 8.51pm.
There was no explanation or warning that the show would be airing at a later time, and fans flooded Twitter with questions.
One tweeted: "Is Casualty going to be on tonight?"
While another said: "I thought Casualty was supposed to be on now."
"Hello. Where are you #Casualty?", penned another.
Casualty airs Saturdays at 8.40pm on BBC One.