My Annoying Ancestor from Eighteen Generations Back

When Xu Jinghe gets into a fight, his favorite thing is hearing people curse his ancestors for eighteen generations. Because the ancestors of the Xu family really were a piece of work: eighteen generations ago, they arranged a marriage for him. Trapped by his engagement, Xu Jinghe has never been in a relationship. The Xu family rules state: Everyone is free to fall in love, except the nineteenth generation. They even laid down the law: If you dare to defy your ancestors and fall in love, we'll break as many of your legs as you have. Xu Jinghe: ... My infuriating (damn) eighteenth-generation ancestor. - Several hundred years ago, the Xu family's ancestor was just a half-baked fortune-teller, wandering around with a divination banner and conning, cheating, and swindling people. By chance, he awakened Ji Jingtu, a god of slaughter who had taken countless lives and was feared by both ghosts and gods. The gray-haired Xu ancestor was instantly moved to tears. At last, this old man had found a powerful patron! He had to cling to him, no matter what! To make Ji Jingtu the Xu family's guardian deity, old Xu the fortune-teller cast the longest divination of his life. When he reached the fate of his nineteenth-generation descendant, his eyes lit up with a greedy gleam. Well, well! What a promising descendant! The nineteenth-generation heir of the Xu family was a perfect match for Ji Jingtu according to their birth charts. They were a match made in heaven. Old Xu immediately decided to promise the nineteenth-generation heir to Ji Jingtu, in hopes of securing Ji Jingtu's protection. With the ancestor's status boosted by his descendant, their family had finally latched onto a powerful patron! - After attaching themselves to Ji Jingtu, the Xu family built him a shrine, sculpted his likeness, and offered incense to him every day. From then on, the Xu family rose from a bunch of nobody fortune-tellers to the foremost family of Celestial Masters. With Ji Jingtu's protection, no one could shake the Xu family's standing in the world of Celestial Masters. At last, the Xu family reached its nineteenth generation. That day, rosy clouds stretched across the sky, flowers bloomed everywhere, and more than a hundred magpies circled the Xu residence, refusing to be chased away. Ji Jingtu awoke from his slumber and hurried over, but the baby had already been born. As he approached, the infant suddenly opened his eyes, smiled, and then... peed on him. Looking at the extra bit of flesh on the baby's body, Ji Jingtu: ... The fiancée he'd waited hundreds of years for was actually a boy! The lifelong bachelor was shocked! The lifelong bachelor was skeptical! The lifelong bachelor... accepted it! Premise: Face desperate circumstances with unyielding determination and a positive attitude