Are you confusing HCV and HBV? The latter is a very big health problem in Asia; however, DAAs active against HCV are not active against HBV, so the HBV epidemic in Asia does not present a business opportunity for HCV drugs other than the interferons.
Here's an article on just a small slice of SE Asia: Vietnam
Asian Theater: Southeast Asia has high rates of hepatitis C infection. Currently, between 5 and 8 percent of the Vietnam population is infected with hepatitis C.2 Hepatitis C could have been transmitted to military personnel through tattoos, medical contact, sexual contact, and shared needles
China has large population infected with HBV and HCV. Estimation varies, but on average about 130m HBV, 40m HCV. China has done a good job in mandating HBV vaccine, thus new infection has been declining; however, China hasn't done much with HCV infection.
Big pharmas are already looking at HCV market in China: