The Scum Villain's Self-Saving System is, at least in this first volume, a fantasy comedy that was originally serialized online, in Chinese. As the series progresses, it gains more serious elements and m/m romance. According to the little genre guide in the back of this volume, it would be considered part of both the danmei (Chinese BL) and xianxia genres. It's licensed by Seven Seas - I bought my copy brand new.
This review includes a few spoilers, mostly because I couldn't help indulging my urge to write about the series as a whole and not just this one volume.
Review:
Proud Immortal Demon Way is an incredibly long online serial, a "stallion" novel about Luo Binghe (referred to as LBH from here on out), a humble young cultivation disciple who is mistreated by Shen Qingqui (SQQ), the Lord of Qing Jing Peak, until he eventually awakens to his demonic powers, gathers up a massive harem, and kills everyone who formerly mistreated him. Shen Yuan has just spent 20 days plowing through Proud Immortal Demon Way when he suddenly dies and wakes up in the body of SQQ.
Shen Yuan had lots of complaints about Proud Immortal Demon Way and was known for being a massive anti-fan. As SQQ, he is told by System, a voice only he can hear, that he's being given the opportunity to "transform a stupid work into a magnificent, high-quality, first-rate classic" (14). It's a chance to finally address the original work's inconsistencies, plot holes, and various details that are brought up only to never be mentioned again. Unfortunately, the original SQQ was a scum villain who betrayed his sect and eventually had his arms and legs chopped off by LBH, the protagonist with invincible plot armor. If SQQ dies the same way now, Shen Yuan is dead as well. His first instinct is to suck up to LBH as hard as he can, but OOC (out of character) behavior is forbidden until he can fulfill some initial requirements.
SQQ somehow has to survive long enough to unlock additional abilities, earn various types types of points (B-points, awarded for being a badass, are the most prominent, but System adds other at will) so that he can afford to break rules or screw up here and there, and somehow still accomplish whichever story events System decides are vital to the book's existence while transforming Proud Immortal Demon Way into a "better" story.