Yeah but he had a handicap too. He had no way of attacking since he couldn’t hurt her. If he could go all out she wouldn’t last a sec and jinwoo knew that that’s why he told ber to not hurt her just to make her lose her will by showing her power difference. And she used her ultimate move which would have been her last gamble and she still couldn’t defeat ber
No, she can't beat his strongest as you can look back once more he was told to not harm her, he was not allowed to do physical damage or use his claws against her. Beru is a nasty opponent to face even when nerfed after becoming a shadow. If we had to technically class him in their hunter scale SSS+ Ranking sounds about right for Beru while Jinwoo is constantly growing and excelling his Rank will always be getting higher so you can't truly Rank him.
If you looked at any of the other Rankers who are stronger than her you will note that they couldn't even get that close to Beru either. All of Jinwoo's shadow soldiers can grow as well keep in mind they can rank up which makes them all the more terrifying.
beru almost killed her once, now hes a shadow and hes stronger BUT SHE STRUCK HIM?? WHAT?? this is unbelievable