https://www.novelupdates.com/series/the-evil-ladys-hero/
here's the link to the novel incase anyone was wondering
I believe the current empress is behind the attack with that beast. because I mean its obvious whose side she is on and its clear she doesn't like the emperor. she even left early as if she knew there was going to be an attack and for those who have caught up know she was behind that certain something.
plot twist- Sieg teams up with the demon king to take out our mc XD
I hope han soo teams with the king - he seems like a pretty cool dude