Lin Fan, a modern ordinary social animal and a history enthusiast, accidentally traveled through time and became a beggar outside Lin'an City in the late Southern Song Dynasty. He was penniless and weak in constitution, but had a flexible mind and mastered modern basic chemistry, physics, medicine, agriculture, military and other knowledge. He had an optimistic and vicious personality, loved to complain, had a bottom line, and valued friendship. His goal was gradually upgraded from "survive" to "support the Song Dynasty, so that brothers and wives can live a good life."
