Oh really...I'm guessing you can speak some Chinese?
If so, feel free to ring your friends and let them know to expect a decent sized group at around 10-11pm that Friday night...
I don't want to make an actual booking as the numbers could fluctuate/decrease on the night but at least if they're expecting a decent group it'll help...
In the past we have walked in unannounced with groups of about 10 and gotten a table fairly easy anyway, but if you have friends there it can't hurt to let them know for us