The Mission:The mission that you do in this game will tell you the whole story from CJ past but then the story change to CJ and his brother.CJ's brother is busted by cops while he in the middle of a gang war(Grove Street vs Ballas)because some of his gang betrayed him then CJ must find a way to release his brother from prison.Because the sittuation is not save,then CJ have to go to another town to find help and then he meet a new trouble like a Yakuza ask help from him,Fight with Da Nang,meet a Corupt cops and other problems.But in the end,CJ succes to release his brother from prison and "chase" the corupt cops and kill the manwho betrayed his Brother.

The Sub Mission:
This Mission can be done or not its upto youbut if you accomplish the mission,you will get many things like Bussiness,GirlFriend and some money.Bussines can make some money but you have to wait for it and check it everytime cause they are have limit and when they reach that limit,the money wont increase again.
Girlfriend can make your sex appeal increase for a while if your progress with her more that 50%

So thats all the guide i hope this will help you