Lin Chuan is waiting for his fiancée at his family's pharmacy when he hears his fiancée Su Manrou returning with a greasy man. He hides in the ancestral old medicine cabinet to catch them in the act, but unexpectedly time-travels to the Daqian Dynasty's imperial palace. Lin Chuan goes to great lengths to see the bedridden crown prince, handing him a bottle of Suxiao Jiuxin Pills, and crown princess Su Jinyan gives the protagonist a bracelet. Lin Chuan gets acquainted with the princess, travels between the two realms, slaps villains in the face on one hand, and opens a pharmacy, farms, and makes a fortune in ancient times on the other.