A Female Ghost From the Start? I Join Bureau 749 and Go on a Rampage

[High-martial world, decisive and ruthless, invincible] Li Shu transmigrates from the start, only to be targeted by a female ghost! At the critical moment, he awakens the System: as long as he kills monsters, he can grow stronger! After killing the female ghost with thunder techniques, Li Shu joins Bureau 749 by chance. From then on, Bureau 749 has a warrior with a perfect six-sided build, beginning an invincible legend as a blood-soaked slaughterer! Just then, the dragon wall at an immortal's ruins is accidentally shattered. Spiritual energy fully returns to Xia Country, the path between heaven and earth opens once more, and an age of great contention begins. Countless monsters and demons emerge from nowhere, while a surging black tide from beyond the borders launches its invasion. Li Shu has only one goal: kill them all! [Successfully killed a Corpse Ghost. Received the Mindfasting Chamber of Sitting in Oblivion. Comprehension is now unmatched!] [Successfully killed a Flying Jiangshi. Received the Sword-Flying Art. Roam freely between heaven and earth!] [Successfully killed a Painted Skin. Received the Blood-Weeping Soul-Shaking Art. The physical body is now invincible!]