Weird: from a Ghost Boy to an SS-Level Ghost Sword Cultivator

My name is Su Feng. I traveled through time and became the weakest little ghost boy among the fierce ghosts. Fortunately, the lying-down system has been awakened and can be upgraded every day by sleeping, dazing, and chatting. If you want to upgrade quickly, you can also transform into a ghost sword cultivator through the Huangquan Sword Code given by the system, and you can kill gods and demons with one sword. . My name is Ling Feixue. In his previous life, he was an S-class ghost master who was one of the top combat powers in the world. I am reborn ten years before the extinction of mankind. This time I must stop this catastrophe and save mankind. In order to prevent the end of the world, I signed an unequal contract with a little ghost boy whose potential can reach SS level. I thought this little ghost boy could help me save the world, but unexpectedly I became its tool. Along the way, it became a container for it to conquer the harem of female ghosts. Am I even obsessed with it? Although it finally fulfilled its promise and helped me prevent this world-ending catastrophe. However, it unknowingly became the new master of ghosts. Isn't this too confusing? This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.