Surprise! I'm the President of the United States of America

Li Wei, a history graduate from the 21st century, accidentally transmigrates into the body of John Adams, America's second president, at the end of 1798, during the Quasi-War crisis with France. As he struggles to adjust to his new identity, he initially fends off probing questions from his wife Abigail and pressure from the Hamiltonian faction in his cabinet, including Pickering and Wolcott, who demand war with France. Li Wei (Adams) then swiftly realizes that a deadly yellow fever epidemic is raging in Philadelphia.

Drawing on medical knowledge far ahead of its time, Li Wei makes epidemic prevention his highest priority and pushes through large-scale environmental cleanup despite fierce opposition, especially the removal of standing water where mosquitoes breed. This is seen as “abnormal.” The effort faces bureaucratic resistance in its implementation, and his political enemies in the Hamiltonian faction, led by Wolcott, Sedgwick, and Harper, seize on it as an opportunity. They question the president's mental state and ability to govern, spread rumors through the media, and portray epidemic prevention as a wasteful fuss over nothing, distracting from a firm stance against France and burdening the public, in an attempt to undermine his authority.