I Make Li Shimin Furious in Great Tang

A modern history student transmigrated into the body of Li Chengqian, who had fallen from a horse and been left unconscious in the seventh year of the Zhenguan era of the Tang dynasty. He awakened an emotion System that let him exchange the emotions of his targets for all the treasures of the heavens. The easiest and most direct way, of course, was to rile up Li Shimin, especially with the living treasure Li Yuan there to help.