All you need to know about Mu Qingfang is that he was the peak Lord of the healers' peak (Qian Cao Peak), their teacher. He has a calm personality (i think) and can be stubborn when needed. He's also, like any other doctor, intimidating when you do what he strictly told you not to.

He specializes in a huge variety of medical practices.

there's literally nothing else I could find on fanwiki to copy paste, this is all my own conclusion.

Now coming to PIDW..

"Proud Immortal Demon Way" written by Airplane Shooting towards the Sky is a cultivation novel that took many readers by storm, becoming by far the most popular stallion novel of the year in the world of Shen Yuan, "influencing countless YY novels thereafter." It is inside this fictional world that the plot of Scum Villain's Self-Saving System takes place.

Shen Yuan describes the novel as "an incomparably long, golden finger against the heavens with a harem greater than three digits, and characters and scenes and a protagonist that even girls would like (...)" "This book's male protagonist, Luo Binghe, doesn't walk the path of the lofty or the path of the waste but still manages to garner popularity among readers. He walks a pitch-black path. But before he was painted black, he walked a bitter path." Allegedly the book is also said to document infinite slaughter".

Luo Binghe's character after being blackened only grows more twisted, full of grievances, with thousands of knives set to kill in his heart.

This is the perfect novel looking for copious amounts of action and those heated scenes bound to happen between him and the hundreds of women who throw themselves at his feet. As long as you can look past the open-endedness and ridiculous amount of clichés. Yet, by the end of the stallion novel, Shen Yuan critizises it for its countless plot holes, plot devices, unfinished back stories, unnecessary subplots, questionable "papapa" scenes, etc... He also makes numerous comments about the absurdity and excessiveness of various tragedies that Binghe is consistently victim of.

Plot (Written by me to avoid as many spoilers as possible, though it's a lost cause, I know now..)

Luo Binghe, the protagonist of PIDW, was found drifting down the Luo River (thus came his name) and was taken in by a washerwoman who later died of sickness when Binghe was a child not much older than 11. He traveled in the streets and finally got into Cang Qiong Mountain Sect, one of the greatest sects of the time, and studied under the tutelage of Shen Qingqiu. There he was bullied and abused but still held on to bitter hope, trying everything in his power to prove himself to his master.

In a competition between the sects, Shen Qingqiu discovered Luo Binghe's half heavenly demon heritage and threw him into the rift that opened to the Endless Abyss (This rift was what originally let in high level demons that the disciples weren't trained enough to face, causing many to die and the competition becoming chaotic). Luo Binghe finally lost his hope, thinking Shen Qingqiu threw him down because of jealousy, finally getting the chance to get rid of him (it has been implied that there's more to it than that).

Luo binghe struggles for five years in the abyss, and finally comes out after conquering the demonic sword Xin Mo. But he's already been so blackened that he takes his revenge out, not only on his master, but the whole of the cultivation world, first conquering the demon realm, then the human (he destroys Cang Qiong and the other sects) and then merging the two worlds, changing the completely trajectory of the world and becoming the sole ruler.

He gathers a harem of all sorts of women after this, demonic and human, and cultivators.

It is implied that his reason for merging the two realms was because of his half demon status, due to which neither the demons were willing to take in a hybrid, nor the cultivators tolerated someone of demonic heritage, forgetting that he's half a human as well.

That's about it, now i can finally get along with the plot!!