I think they are criminals and were either robbing the wedding or planning to take a hostage. The Catering staff anyway. I believe they are all criminals and are working for the family or for Edgar.

I really think there's a major scam going on and someone at the wedding is responsible. Well, honestly, I think the family is not really a family. I think they are a team of scammers and the wedding and crypto fits into the scam somehow. That's what Edgar meant when he said, "Your all devils." Edgar was really having a break down because he was in love for real at this point and couldn't take the lies any more.

I think Hannah killed him because she was his actual girlfriend and was mad, he found real love. This also explains why Sebastian came into her room with wine. They were supposedly raised together so why would he do that? Unless That story of them being a family is a complete lie and it's all a con.

Let's also not forget the mom was not so broken up when he died nor has, she been. I don't think she's his mother and due to that she's never really had an attachment to him. I think her real son is Sebastian. The catering staff are part of the plan somehow maybe they are stealing personal information and valuables. That's all I can figure for now.