Ghost Doctor Feng Jiu's manga can be viewed online for free. For details, please refer to the following website: 1. Comic Island: This is a website that specializes in providing comics, including Ghost Doctor Feng Jiu's comics. You can find many other popular comics here and you can watch them online for free. 2. Home of Comics and Animation: This website is a comprehensive animation website that includes many comics and animations. Ghost Doctor Feng Jiu's manga is also included. You can find it here and watch it for free. 3. Cool anime: This website provides various types of anime resources, including comics, animations, movies, etc. Ghost Doctor Feng Jiu's manga could also be found here for free. The above three websites are all platforms that provide free online viewing of Ghost Doctor Feng Jiu's manga. You can choose one of them to watch according to your preferences.