My Understanding Is Incredible, My Sister-In-Law Is Actually a Saint from the Demon Sect

[Comprehensive martial arts + system + extra points + invincibility + decisive killing + Wei Wu legacy] When he woke up, Yang Qian traveled through the chaos of war. This place is divided by dynasties such as Da Qin, Tang, Li Yang, and Beili. There are also forces such as Xueyue City, Emperor Wu City, Tianxiahui, and Yihua Palace in the rivers and lakes. In this era when aristocratic families monopolize spiritual resources and treat common people as nothing, Yang Qian is just a precarious poor man at the bottom, who has to take care of a sister-in-law who is unparalleled in beauty but weak and unable to take care of herself. Harassment by gangsters? Oppression by powerful people? A thin line between life and death? At the critical moment, **[God and Demon Point Adding System]** awakens! "The cultivation speed is too slow?" - Turn on the cultivation speed ten times, and the basic internal skills are perfected overnight! "The technique is too rubbish?" - Obtain the mysterious human skin map and unlock the "Seven Limits of Devouring Heaven and Destroying Earth" inherited from ancient gods and demons! "The enemy is too strong?" - Deep Blue, give me more points! Power +99999! Yang Qian rose from humble beginnings, protected his sister-in-law, wiped out family members, stepped into the world, and shattered the void! Yaoyue: "Yang Qian, Yihua Palace would like to respect you as its master!" Li Hanyi: "Wenjian Yang Qian, if I lose, I will be yours too." Huanwen: "Yang Lang, I only dance the Demon Dance for you~" A few years later, Yang Qian stood on the top of the imperial city, with all the monsters behind him surrendering and all the nations at his feet coming to court. Yang Qian: "Sister-in-law, look at this picturesque country, now everyone's surname is Yang!"