High Martial: Solving Cases Makes Me Stronger, and the Princess Empress Has Lost It

Xu Yang transmigrated into this world, where he was the family's disowned son and betrothed to the eldest princess. He was murdered by a treacherous villain! Luckily, after getting close to his bargain wife, the eldest princess, he joined the Demon-Suppressing Office and activated his golden finger. As long as he solved cases and completed missions, he would earn rewards! [You solved the case of the official seal left behind in an empty post. You received the White Emperor Sword Scripture!] [You solved the case of military funds claimed for nonexistent troops. You received the Sword Art of Time!] [You uncovered the case of the real and fake princesses. You received the Human Emperor's Heaven-Imprisoning Palm!] [You solved the case of the Great Li Emperor's death. You helped the eldest princess ascend the throne and earned her favor, receiving the Immortal-Slaying Sword Intent!] Looking at the cool and aloof eldest princess in his arms, her cheeks flushed, Xu Yang sighed. I am no gentleman. One day, the dynasty fell. Heaven and earth were shaken as countless powerful beings from other realms invaded, and immortals descended! The eldest princess's claim to the throne was on shaky ground when, at that very moment, a sword of immortal slaughter flew down from beyond the heavens. The immortal perished, and all paths collapsed!