Above the source of Tao

The world is vast and the way is complicated. With the heart as the witness, the way can be achieved. On an ordinary night, a young man asked for medicine. His grandfather entrusted him with medicine before his death, and since then Yun Changan began his bizarre and wonderful life. My name is Yun Changan. There is a book called, which can record the way of the world and use it for oneself... There is a lamp called Siyang Gourd Lamp, which can devour everything in the world... (No system + traditional oriental fantasy + no harem + pig's foot humor + inherently black belly + very 'cheerful', the story is very long and a bit slow.)...