Thanks. I'm booked in Go (was able to choose a window seat in row 31, so no need for Plus) and due to EBG status I'm not really concerned about not getting on this flight. But I was debating if it makes sense to show up a bit earlier at the gate to volunteer in case there is an overbooking. Either to get a voucher or profit from good karma by snagging an upgrade to plus (ok, the latter is fairly unlikely, but sometimes the planets align and SK staff is in a good mood).
I guess C is full because of the Shanghai Auto Show.