Transmigrate to the Tang Dynasty: The Zhenguan Golden Age

This was his forty-third transmigration, and his destination was the Tang Dynasty during the Zhenguan era. He hadn't completed his previous transmigration task because its difficulty was too high, so the System sent him straight here, leaving only a message behind: "Task duration: 50 years. Task: Help the Tang dynasty gather fortune. Once it reaches the required standard, I will reactivate and initiate your next transmigration, sending you home. If you fail, your punishment will be 100 years of being single! Good luck!"