Was there a novel about a young man who was despised by his family and had poor aptitude? Later, his only maid (whom he regarded as his sister) was an extremely sinister person?

There was a novel about a young man with extremely poor aptitude who was not valued by his family. Later, his only servant girl He was sold to the Spring Brothel by his brothers. When he heard the news, he was knocked down by a stone in desperation. He felt a pain between his eyebrows and accidentally opened his Heavenly Eye. From then on, his cultivation was smooth. He even subdued a rat-like divine beast in the forest (the one that could evolve, the one that evolved under the mulberry tree later, was called Little White). I tried very hard to think about it. A few years ago, it was a free novel in the bookstore. Due to some accidents, it didn't finish updating, so it only updated to 200 to 300 chapters. The last chapter was about him finding an imperial level swordsmith to help him forge a holy weapon (the raw material was a famous triangular pyramid shaped holy weapon from ancient times). At the end of the soul casting, a person who looked like the servant girl he saved attacked him. Please tell me if you know about it. I like this novel very much. It's written very well. Although I haven't finished it, I still want to make it a souvenir!