Great Tang: From the Start, I Rebuked Li Shimin to His Face and Became a Court Celebrity?

【Hello, Mr. Jiang from the twenty-first century. I’m an operator from the thirtieth century.】 【First, we sincerely apologize. Due to an error on the part of our staff, you transmigrated to the fifteenth year of the Zhenguan era. You may choose to return at any time.】 【Return method: Be sentenced to death by the reigning emperor, Li Shimin.】 【To compensate you for this error, we will award you a prize of one billion yuan. We appreciate your understanding.】 A System bug sends Jiang Xu to the Tang dynasty by mistake. But with the System dangling that huge, round carrot in front of him, he drifts farther and farther from the path of courting death...