do i need visa also how much are the fees? can i submit my application by post from daegu?

Dear, you need it. If you come to PRC for tourism purpose, you should contact with the CVASC in Busan to consult whether they will issue the tourist L type to independent tourist with Pakistan passport. If yes, you can apply for it. You can choose to post your application to the CVASC.
As for the fee, if you apply from the embassy of PRC in Pakistan, it’s free, but I’m not sure that it charges or not when you apply in a third country. You should call the CVASC and confirm it.
Call: 1670-1888