Quit HSR from burnout since Castorice Reveal

>2 weeks ago let my friend accountsit just in case I want to return
>Got Phainon
>Got Phainon LC
>Got Tribbie
>Today I got Saber and Saber's LC
I'm thinking I'm back

Wont't play until I catch up with the story cutscenes on YT tho, but can anyone fill me in on the meta lore? I'm talking about stuff like the MC VA swap and something about Cypher vs Jiaoqiu