do they know that everyone is a loong or it's just the 8 of them?

all of them are Loongs.

I think other than the 8 of them, huo huo is know already. But idk with the tan guy (i forgot his name lol)

i dont think the tan guy knows the other 7 are loongs but in a chapter he said they felt familiar but everyone else knows.

huohuo knows that the other 8 are loongs? so all of the loongs already knew each other except for the white hair with tanned skin?

yes