Comprehensive Comic: Swinging the Knife a Billion Times Is the System's Lie

After traveling to the world of ghost destruction, the system required Xia Qiansheng to swing his sword a billion times before he would be rewarded with invincible swordsmanship, but... Xia Qiansheng looked at the number of swings of his sword that were far from enough and the dissipating body of Kibutsuji Muzan, and fell deeply into thought... If it is not Long Ao Tianwen, the protagonist has a certain growth process, so please don't enter if you don't mind.