The protagonist, Liu Qijiu, an attending physician in the cardiology department of a public tertiary hospital, accidentally travels to the parallel world of the Yongle Dynasty of the Ming Dynasty while pushing a rescue vehicle. Watch how he went from being a businessman's son who refused to take the imperial examination to running away from home and traveling, saving lives and healing the wounded, and experiencing the various forms of fame, love and hate. Love, hatred, friendship, and unexpectedly became life and death friends with Ming Xuanzong. In order to prevent his short-lived friend from dying young and for his career as emperor, he was not allowed to enter the officialdom. While saving lives and healing the wounded, solving the mystery of early death, he broke up with his lover. In the end, he retired with great success and left his name in history, leaving only one regret.
