I don't understand but I'll act like I do
Basically the Big Bad Guy (the one controlling Geto's body) is trying to turn non-sorcerer people of Japan into curse users (cause he believes that sorcerers are the 'evolution') but to do that he needs a HUGE amount of power, so he has been scheming a big plan all this time for which he needed Geto's ability, to get the Six Eyes user out of the way (Satoru) and Tengen's evolution (by not being able to merge with the star plasma vessel).
Tengen evolved into something that is more like a curse than a human (he used to be a human curse user) so now the Big Bad Guy can control him thanks to Geto's ability (of controlling curses) and use Tengen's powers to turn all Japan's population into curse users. And this will be really really BAD.
Sukuna and Yuuji are of some use on all this plan but is not explained yet.
Tbh I feel the the king treats the Mc more like a daughter... I dosent help the fact she kinda looks like if the kind and the saint lady had a kid.
I agree. I get no romantic vibe. In fact, the king seemed a little excited that his brother likes her. More than a daughter, he treats her like an older brother would treat a little sister. He constantly teases her and is amused at all her antics. I like that kind of relationship and hope it stays that way.
Woah I actually got scared for her when she opened the door and imagined that piece of shit coming in, I hope she eventually will get revenge on both of those fuckers