Story 11-4

So i played The spike a long ass time back and i recently came back like around 3-4 days ago. I was super hooked onto the story cuz i liked the idea of getting Siwoo Baek S+. Turns out you cant get him but i was still determined to finish the story. It was smooth sailing until chapter 11 episode 4. How the fuck do you beat this level. Up till now ive only used Siwoo to beat the story and if it was a bit hard w siwoo then id switch to the only A+ spiker i have. I have no higher rated spikers. My team was basically an A middle blocker, B+ setter and B/A+ ws. How the fuck do i beat this level. its been pissing me off so much. Also any advice on how to get S tier characters easily and V points is also hella appreciated. im f2p